Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a137dbd485764c…

MALICIOUS

PDF

40.9 KB Created: 2020-08-20 11:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4dc13ea5b912373280a6e4fe8c18e35e SHA-1: ae4954f2e9236163fd8361580a58e88406a406d1 SHA-256: b1a137dbd485764c1269a643213a3b0cf899e4574a13d6f4ab90e3ac145d8cac
194 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to PDF files hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=engineering+drawing+multiple+choice+questions+and+answers, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same malicious URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted from this sample.

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=engineering+drawing+multiple+choice+questions+and+answers In PDF document text
    • http://files.carolineludovici.com/uploads/1/3/1/3/131384025/savag.pdfIn PDF document text
    • http://bekagozim.strotherlab.ca/uploads/1/3/1/0/131070786/998af636930a.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/1/0431/2819/3184/files/guide_mass_effect_andromeda_fr.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/acca_f9_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/suxenisojatez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0444/4015/8374/files/concept_of_mass_communication.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8676/4446/files/traffic_reports_bridgwater_somerset.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7207/0556/files/wowefefasokurop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/mewitogevezukamiza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0449/1404/9191/files/mage_the_awakening_1e.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/23290016832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8568/5153/files/gupinijakajujemujoguzi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/calculus_integration_techniques_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6975/8874/files/administration_of_justice.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
🗂 Part of campaign: strotherlab.ca 3 samples

Related samples 1

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_off0000612f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612F 5664 bytes
SHA-256: 83171143a375878a05999e564893f22a1b791577d1875d1d9f61de996684e3b3
font_01_sfnt_off0000744d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x744D 10044 bytes
SHA-256: d33642cd4b6395ec02e0d54e2c108f777a0721a2a13b2374f834b339208f8e33

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