Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3bca8e1deb49a8…

MALICIOUS

PDF

56.0 KB Created: 2020-07-08 17:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 1f6b5be8e3dde0147900e642d0ded798 SHA-1: 6e4bc47b5e021647f8d7d804e72dfc6160b80121 SHA-256: 8b3bca8e1deb49a8f18d273b5ae9b10ad283019aebc45fea9b4a4eb3c5d6b252
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body text, though partially corrupted, contains keywords related to 'recruitment notification' and the URL itself, suggesting a lure to trick users into clicking the malicious link. The presence of a link farm heuristic further indicates a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=crpf%20recruitment%202018-19%20notification%20pdf In PDF document text
    • http://files.nakedfranktheatre.com/uploads/1/3/0/8/130874458/ec4288f3eb.pdfIn PDF document text
    • http://files.pawsforacauseinvitational.com/uploads/1/3/1/4/131438002/2076b15.pdfIn PDF document text
    • http://files.ronnieroseband.com/uploads/1/3/0/8/130813797/a7f99.pdfIn PDF document text
    • http://files.threeaineconsultancy.com/uploads/1/3/1/0/131070125/587526f65.pdfIn PDF document text
    • http://files.afmsupplements.com/uploads/1/3/2/3/132302815/972851.pdfIn PDF document text
    • http://files.mi-sheffield.com/uploads/1/3/1/6/131606368/niludavifek_rerodotite.pdfIn PDF document text
    • http://files.flamentrealestate.com/uploads/1/3/2/6/132681281/kesirive.pdfIn PDF document text
    • http://files.cornwallamillionactsofsanctuary.com/uploads/1/3/1/6/131606619/a19e9c.pdfIn PDF document text
    • http://files.marriedmarks.com/uploads/1/3/2/8/132816158/wawezanuz-titun-resuta-ponupax.pdfIn PDF document text
    • http://files.theladyjaneva.com/uploads/1/3/0/8/130873971/pepinepijesowel_mewonedogideg.pdfIn PDF document text
    • http://files.mairibudreau.com/uploads/1/3/0/7/130776864/ziwawajobigogefivane.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://womotisuxapo.files.wordpress.com/2020/06/naxagaguzipu.pdfIn PDF document text
    • https://lubizup.files.wordpress.com/2020/06/65369412645.pdfIn PDF document text
    • https://xupapinir.files.wordpress.com/2020/07/burugimovabemu.pdfIn PDF document text
    • https://likoxodafan39484776.files.wordpress.com/2020/06/mabarebitinowag.pdfIn PDF document text
    • https://zejefasa.files.wordpress.com/2020/06/kewibevoxajebotifibi.pdfIn PDF document text
    • https://bebeleg.files.wordpress.com/2020/06/levelupomafore.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/90442425312.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75901524911.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7717 5704 bytes
SHA-256: 85ad53c2265df77b7f96c3172315fd50cd2118fc13b81aba937927c2229d0471
font_01_sfnt_off00008a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A65 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off000095c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95C8 12192 bytes
SHA-256: 7a35a9f91897913a00c846851a1ae1e706de2c3091de03424df1d318261e8bab
font_03_sfnt_off0000bc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC61 6092 bytes
SHA-256: d9e18aee63f4bbf888a4f8276e7e0656be78ca2c4c0c628a171881fe352709e6

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