Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61869a65cd62159…

MALICIOUS

PDF

54.5 KB Created: 2020-08-13 20:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: bbc00045428472ec7f5fecfe4131c0ab SHA-1: e5eda59cbfd0e4175bc6ba510c02c7929caf09bc SHA-256: a61869a65cd6215914a34006c2caca4a1b067462dcc825540a4352b0d42a6ebd
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with the primary malicious redirector link being https://ttraff.ru/wb?keyword=english%20alphabet%20pdf%20free%20download. This indicates a likely SEO poisoning or link farm attack designed to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=english%20alphabet%20pdf%20free%20download In PDF document text
    • http://files.thesomervilleflea.com/uploads/1/3/1/0/131070313/3089203.pdfIn PDF document text
    • http://files.mumma-baby-space-online.com/uploads/1/3/1/6/131606261/e36a405730c4d6.pdfIn PDF document text
    • http://semujes.1ofafindonline.com/uploads/1/3/1/3/131380005/zepovabudiki_sugasotosat_wewalifa_jijeman.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/1/0438/4922/0256/files/pedialyte_nutrition_facts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1808/2709/files/add_text_to_acrobat_pro_9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/2232884606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2172/8933/files/nuxedapanujijunitamipef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2513/6792/files/cours_dissection_aortique.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4896/7061/files/basic_energy_io_crystal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/74484371675.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6498/2693/files/rowoberexodub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0200/3615/files/attestation_pole_emploi_assistance_maternelle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1059/6765/files/facebook_page_url.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/modasawigir.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 5

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_off00009b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B8E 5492 bytes
SHA-256: 5c04d568869d08dad3ee65543c7fc1e1fdda78bf71476870bc97b73113ab5f74
font_01_sfnt_off0000ae3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3E 8968 bytes
SHA-256: 4fa04516755bbc06fb2c6458f6d87260c658da7a047f48178ad741d428e8783c

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