Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5b89469c484e0c…

MALICIOUS

PDF

42.2 KB Created: 2020-07-09 04:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: a8f920f3645f1d0c10dea3e1f5d2cfe0 SHA-1: 31f0f46be217924ab76a93e540ee9b26e47013d7 SHA-256: 8c5b89469c484e0c7ae50f22328bf010bdbed8cb826f9ebebfc7a09a57df22c5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links designed to redirect users to malicious sites, masquerading as an educational worksheet. The primary malicious URL identified is https://ttraff.ru/wb?keyword=anatomical%20orientation%20and%20terminology%20worksheet. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports the malicious intent.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=anatomical%20orientation%20and%20terminology%20worksheet In PDF document text
    • http://files.nwflyboys.com/uploads/1/3/1/6/131606335/c06bb2c94.pdfIn PDF document text
    • http://files.orionavevannuys.com/uploads/1/3/2/6/132681281/55c0d5ea03634ba.pdfIn PDF document text
    • http://files.studiotalyne.com/uploads/1/3/2/6/132681938/2202113.pdfIn PDF document text
    • http://files.drmonicamody.com/uploads/1/3/0/7/130775870/db888f.pdfIn PDF document text
    • http://files.farmacybotanical.com/uploads/1/3/2/3/132302973/xutitogesafa-lixoreriberexik-larowuwonubola.pdfIn PDF document text
    • http://files.chicagoschoolofgrappling.com/uploads/1/3/1/4/131409170/312064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pipupuza.files.wordpress.com/2020/06/xijikabegisofimer.pdfIn PDF document text
    • https://xosatige.files.wordpress.com/2020/07/45131574639.pdfIn PDF document text
    • https://jedawixi.files.wordpress.com/2020/06/pifatotodabos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75130531250.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vazakiliduvapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6745 5388 bytes
SHA-256: 2a7cee66c02e6217d0b2dc55b1698e44cc377a49395634e144617df3e06aa506
font_01_sfnt_off00007978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7978 10040 bytes
SHA-256: 7c02b0f4c027e386b85ed8a26fd32530f7d386d6e315b0d1a90dffa3e8ee6f2b

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