Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87352c774e95b8d…

MALICIOUS

PDF

36.5 KB Created: 2020-08-21 19:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cc9becbd53f7f9ca5cdb314c07725db2 SHA-1: a0b805cfd8e0f1bd01d1d7bfce02b8f848bd45c9 SHA-256: b87352c774e95b8d2de10cafffc959170dc0db3289b11c45589f4ebdd54a7636
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, while heavily obfuscated, contains a URL that appears to be part of this malicious link farm. The primary attack pattern involves tricking users into clicking these links, likely leading to further malicious content or exploits.

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.cc/pify?keyword=solubility+guidelines+for+ionic+compounds+in+water In PDF document text
    • http://migezu.pwcyoga.com/uploads/1/3/0/8/130813834/0584f65.pdfIn PDF document text
    • http://rasekul.ruthnadiamassage.com/uploads/1/3/2/8/132814930/gulekipifuzikixijere.pdfIn PDF document text
    • http://xisame.everlastingrockministries.org/uploads/1/3/1/4/131410299/gunupeki_kadaf_binujolebato.pdfIn PDF document text
    • http://lesixoga.cedartreeproject.com/uploads/1/3/1/4/131412713/f3bb4.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/1/0437/1048/0533/files/gas_scrubber_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/jogos_para_uma_aprendizagem_significativa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/bd_chaurasia_anatomy_volume_1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1483/0749/files/behringer_x-_touch_compact_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/bruel_kjaer_pulse_labshop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2693/1099/files/anunnaki_livro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/1268200325.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/golikunesozojozivekomaliv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5887/2998/files/nuklearna_fizika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8351/3499/files/11409220620.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_off00004f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F23 5912 bytes
SHA-256: 420808f367bcd8ace07a390bccb8d46a47205a006ba66c900c7fd70645f49400
font_01_sfnt_off00006336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6336 9908 bytes
SHA-256: e2ac59ae78a28924bdb4094383125516729244d496b3afa53932dc12f4b20c40

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