Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41370bc0b29a563…

MALICIOUS

PDF

53.8 KB Created: 2020-07-08 15:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: a25569910e4925855cad71da396a1924 SHA-1: 079e190548dc999166be8f9408b3c9c099722192 SHA-256: f41370bc0b29a563da7a5a914c9705c8779990f1cb7553f0ea02dd752d665bf4
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including a direct link to a known malicious redirector. The document body, though obfuscated, contains text suggesting it is a 'user manual' to lure victims into clicking these links. The presence of a link farm with many PDF links further indicates a malicious intent to distribute harmful content or redirect users to malicious sites.

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=kiev%2088%20user%20manual In PDF document text
    • http://files.heatherseastheworld.com/uploads/1/3/2/7/132710575/8189334.pdfIn PDF document text
    • http://files.ninjamagik.com/uploads/1/3/0/8/130874629/jatupisejumelovavog.pdfIn PDF document text
    • http://files.grundmeyerleadersearch.com/uploads/1/3/1/6/131636990/sifixoj_jutixepipi_bevasagipaxuja_sivosukisozi.pdfIn PDF document text
    • http://files.katiemachain.com/uploads/1/3/1/4/131455283/57a787ca629.pdfIn PDF document text
    • http://files.willsphotographypa.com/uploads/1/3/2/6/132682681/mawudi-tazewuja-duveditusifed-sugitefad.pdfIn PDF document text
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdfIn PDF document text
    • http://files.jjsdka.org/uploads/1/3/0/9/130969819/98a098cf.pdfIn PDF document text
    • http://files.cninc.org/uploads/1/3/2/7/132740479/5324237.pdfIn PDF document text
    • http://files.tynksgemstonedesigns.com/uploads/1/3/2/7/132740415/7381d2f1749d4.pdfIn PDF document text
    • http://files.alifeworthliving2.org/uploads/1/3/0/8/130874318/lenalaw-fowez-legojumafixixin-tunotababivofen.pdfIn PDF document text
    • http://files.arlingtonmsband.com/uploads/1/3/1/6/131606087/ddee7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jagenanevor.files.wordpress.com/2020/06/53563344002.pdfIn PDF document text
    • https://ratuwig.files.wordpress.com/2020/06/winivepupokixu.pdfIn PDF document text
    • https://mirumiw.files.wordpress.com/2020/06/5077215615.pdfIn PDF document text
    • https://kinifevo.files.wordpress.com/2020/07/zanenetufamumufisubim.pdfIn PDF document text
    • https://jomagex.files.wordpress.com/2020/06/voromowarelorazedizib.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_off00008f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F85 4748 bytes
SHA-256: c074be02e8e99d9e64cb8b364eed967d39e462698ce5d7af38b517e0657842b2
font_01_sfnt_off00009f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F7A 13808 bytes
SHA-256: e549498fd8da4eb0023afef57a3b33efce56539daf72db458ae2b4cd28ef86c6

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