Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f3dc8b524a1619…

MALICIOUS

PDF

48.7 KB Created: 2020-07-29 07:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fc249d9f340437f04d3b301f51d5655b SHA-1: 39693059d5184020f4590c7c1e6a9d6c76f63681 SHA-256: 39f3dc8b524a1619d934cd8f794a57f0e252513795f422e9592af4d5fe78fbda
194 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and heuristics indicate it contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO abuse. The primary malicious URL identified is ttraff.ru, which is known for malicious redirection. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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/pify?keyword=root+android+tanpa+pc+2018 In PDF document text
    • http://files.kaitcalabro.com/uploads/1/3/2/7/132712235/3718701.pdfIn PDF document text
    • http://files.criticaltourismstudies.com/uploads/1/3/1/1/131163684/pajifubumositi.pdfIn PDF document text
    • http://files.stronghabitsforlife.com/uploads/1/3/0/8/130814411/3461568.pdfIn PDF document text
    • http://files.catholicchurchofantioch.eu/uploads/1/3/1/6/131606069/gumurimok_sujadudowaxeso_rixorira.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7027/4201/files/watixijewep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/58001605888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2207/4534/files/6377913561.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/275810409.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/panirejejidopodamuzazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/lerofilipewix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0193/0143/files/wovojibesojo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mirizopenifipometetotagoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/94696526085.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 6

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_off00008281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8281 5056 bytes
SHA-256: 480d732a28790d765f871291b24e078fb5f10031e786a9ed38e5d5b35a595030
font_01_sfnt_off000093b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B1 9996 bytes
SHA-256: 1318ea13b45fc9b0174ec13b54676c085f7a552900bd41bd20f5d57197edc2bf

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