Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf8d91bbbc78f0a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-11 20:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 37ec5ca6d3673776c7cea5b120d6a41d SHA-1: 9f871b749104ce8425f65d53e0d0f20ccb9a297d SHA-256: 1bf8d91bbbc78f0ab57e1fa02ce093078f82a2995ab4279f3571212cfcf775b5
234 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that leads to a redirector, which is likely part of a phishing or scam campaign designed to lure users to malicious sites. The presence of numerous external links, many pointing to Shopify domains, suggests an attempt to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=christmas+crossword+puzzles+pdf In PDF document text
    • http://vifale.lifeisbeautifulandhealthy.com/uploads/1/3/0/8/130814729/bd52019a.pdfIn PDF document text
    • http://files.swarthmorehorticulturalsociety.org/uploads/1/3/1/4/131438038/tobalusib_minakotow_viwofeniwute.pdfIn PDF document text
    • http://files.brennafitzgerald.com/uploads/1/3/0/9/130970001/3376403.pdfIn PDF document text
    • http://files.aiacademy.net/uploads/1/3/2/6/132683357/804602.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/1/0427/8714/3839/files/21986391423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6703/8109/files/tilusur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2060/5848/files/zadikozoduxerazajaloxupal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44758106853.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/pisogagujemopev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1737/1797/files/zekikuzaxu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/certificado_medico_gratuito_bolivia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/wild_horses_the_sundays.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2171/3060/files/kinematics_equations_of_motion.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8311/8232/files/caleb_maddix_book_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/nukafug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64BB 5440 bytes
SHA-256: db01e9eb800d1a44960e067d330e314e2a0d691dd3256c061c4c660dc4b3fe20
font_01_sfnt_off0000772e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x772E 10468 bytes
SHA-256: 6aec23fdb2391674c07fd59dd639ec815972f549a26635000ea4b01ccad16fe1