Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70c4f7433bc910f…

MALICIOUS

PDF

46.8 KB Created: 2020-08-07 21:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3c26a50ce2d4fc9db8e3fbe933a9d370 SHA-1: 3c1a283eb09653ae9973bd826cc64aaf42740d35 SHA-256: a70c4f7433bc910f4ff6776ee981e0fd7694aab169e5ee41ed847d415dd4e955
194 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The primary URL identified is a redirector service that appears to be used to obscure the final destination. The document body, though partially corrupted, contains text related to 'hipertrofia de adenoides en niños pdf', suggesting a lure to disguise the malicious intent. The presence of numerous external PDF links, many hosted on Shopify, further supports the link farm tactic.

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=hipertrofia+de+adenoides+en+ni%25C3%25B1os+pdf In PDF document text
    • http://files.fixyourmess.com/uploads/1/3/1/3/131378993/ferefegalemoxu-xelewovixawad.pdfIn PDF document text
    • http://files.jocelynphotoblogs.co.uk/uploads/1/3/1/8/131856945/14678f7e0.pdfIn PDF document text
    • http://files.metrolandrealtyph.com/uploads/1/3/1/4/131437983/469b2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3705/5393/files/warelapifigomif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6735/6824/files/95227265353.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/xipasiwunibomaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/biotecnologa_manual_de_microbiologa_industrial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/rulotezusiji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/4620744821.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/5032/4388/files/paper_bow_tie_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0988/4838/files/simevenalunixesasosorapaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/49981213664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1646/8133/files/95344217639.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8694/6212/files/75647829676.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A5 4964 bytes
SHA-256: 8a0db5c748bcba64a058a15cd3e2f55d2690c5252c5a4a40ded26f463a15b4be
font_01_sfnt_off0000793e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x793E 11344 bytes
SHA-256: d0bf4232d8f2622eb6b7770cabc36b9ad8e85ce102068f57fc25ca13b791c7a3
font_02_sfnt_off00009e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E11 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71