Malicious PDF — malware analysis report

Static analysis result for SHA-256 643538d90df5078e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-06 10:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 930188e7f744d1541be946f5ff1d67c8 SHA-1: fb5a9158e3e62feb99f9cdc18939374644484de0 SHA-256: 643538d90df5078ea6a4f1cdcdf638a1b32b913a53b7bf368ae3ed9ed6892fa5
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to artificially inflate search engine rankings for malicious purposes. The document body, though heavily obfuscated, contains the redirector URL, indicating its likely purpose is to funnel users to potentially harmful sites.

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=addition+subtraction+worksheets+pdf In PDF document text
    • http://files.undertheskyevents.org/uploads/1/3/0/8/130813516/fd479eef.pdfIn PDF document text
    • http://files.findingspecies.org/uploads/1/3/2/7/132741709/642144.pdfIn PDF document text
    • http://files.singlesretreat.net/uploads/1/3/0/7/130775126/334d77d2.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/1/0428/9835/8432/files/85755015361.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3882/6918/files/33233205446.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/bamunobokizusam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0443/0426/9468/files/money_making_guide_rs3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/41073812199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8814/9668/files/21612980654.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/kutoxixavemiluvu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/98730584439.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1663/2992/files/ab_wheel_workout_routine.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/tonememamuzopuraji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/4558/7877/files/domestic_violence_act_kenya.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4937/0268/files/81833272738.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 3

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_off00005f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1F 5496 bytes
SHA-256: b59d4fc3a93afc973265422d808263db9351b9ed189f55da4e7cf10f89d30a2c
font_01_sfnt_off000071da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71DA 10352 bytes
SHA-256: f2824ff5744e77d129042985adf1a02e15775e6af9ad2d57e5f7cab88d3550f2

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