Malicious PDF — malware analysis report

Static analysis result for SHA-256 257543bd716a0c6e…

MALICIOUS

PDF

35.8 KB Created: 2020-08-11 21:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4c8966fd744fe00cfe2cb33e35eaafa8 SHA-1: 5b379da756185e6d98112eff839f7f7d9445f795 SHA-256: 257543bd716a0c6ee4a57a2e92d7d6911d656db160d42cc90d62bc8cbfa332bb
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 benign Shopify domains, but one critical link redirects through ttraff.cc, a known malicious redirector. The document body, though heavily obfuscated, contains the text 'Agricultural science grade 10 book pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a malicious redirector indicates an attempt to lead the user to a harmful site.

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=agricultural+science+grade+10+book+pdf In PDF document text
    • http://files.yashbangera.com/uploads/1/3/0/7/130738625/83486b04a35.pdfIn PDF document text
    • http://files.workforcegateway.org/uploads/1/3/1/6/131606434/523783df.pdfIn PDF document text
    • http://files.suzannewilliamson.net/uploads/1/3/1/4/131407111/3141609.pdfIn PDF document text
    • http://files.bcbarns.com/uploads/1/3/1/4/131452922/9423379e34fd.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/1/0428/0372/4455/files/mumolaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/23229805885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6598/3655/files/96611733580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/77152681447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0346/1283/files/bidujulez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/essentials_of_pathophysiology_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/34842438784.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/bosofonilunozum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/60436142107.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6911/1449/files/3319119602.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_off00004bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BDF 5708 bytes
SHA-256: 9701a3681596a2b5f3297f6813c81700270ac6ce44ba112f3f126c44cfa74d93
font_01_sfnt_off00005f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5D 10244 bytes
SHA-256: 2ba7181cc6b8bf9d1e4213a8bc896678087fa7b12429404527dab954c82c0b58

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