Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31063c588469d2c…

MALICIOUS

PDF

43.7 KB Created: 2020-08-01 13:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ef67da0f8f901ea08a2848b5bc1ea8cf SHA-1: 76d01368faaddcb22671e83455ffe8067d6982c0 SHA-256: b31063c588469d2cade02e0c6bcfe7638d114e2cb29c7217d69f86db9ef326be
202 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to a 'free mblex study guide pdf' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of numerous links, many pointing to Shopify domains, indicates a link farm strategy to improve search engine ranking for malicious content.

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.ru/pify?keyword=free+mblex+study+guide+pdf In PDF document text
    • http://files.indianausbr35.com/uploads/1/3/1/4/131455680/peduvonedi.pdfIn PDF document text
    • http://files.shakirazchi.com/uploads/1/3/1/4/131408241/c3954e41.pdfIn PDF document text
    • http://files.harvieherrington.com/uploads/1/3/1/8/131871745/82bb851af044.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/1/0431/6954/6395/files/21895923638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/renatafuxuregitebe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2363/7399/files/34423261338.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/jofiwexiravori.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71062637782.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4907/3312/files/bizevureli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7133/1742/files/13457591102.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4228/3432/files/36824896264.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9073/0398/files/foriwiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/29244290285.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0279/0039/files/ruvewebizokofamozifu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/xokilogoledijazurum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9330/2178/files/math_background_image.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/488968936.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_off00006b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B66 5416 bytes
SHA-256: 9a7802d617846d8af71ba8a7e85d75a555bf214bbc56c13c74f6c463dbb0d8b5
font_01_sfnt_off00007dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCA 10696 bytes
SHA-256: 762adf04a5d23423fcf957a366bb4db11a8bdf0ec0cb86dc6c3478c92125ca20

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