Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a3bf115d74166e…

MALICIOUS

PDF

52.2 KB Created: 2020-08-27 14:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: e88ebcef41d513c0a249f06c9aa029c9 SHA-1: 2e60f0265e515ff26812f74ff79a3c6c313b6bf9 SHA-256: 38a3bf115d74166e712212b80eb02178ac76d5d9fd2a88449cffe6821c07af22
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'https://ttraff.com/pify?keyword=formula+para+muestra+finita'. Another critical heuristic indicates a PDF link farm, with many links pointing to Shopify domains, suggesting an attempt to obscure the true malicious destination. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector URL and the link farm strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=formula+para+muestra+finita In PDF document text
    • http://files.cupfestfairs.com/uploads/1/3/0/7/130739789/de553c13138b.pdfIn PDF document text
    • http://files.nightsongpettingzoo.com/uploads/1/3/1/6/131606121/zegodikaxa.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/1/0427/6197/8023/files/japegurorajizoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/nawabudigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/sumolozaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/85237469948.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/8471614043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1868/9432/files/genesys_character_sheet_fillable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/3021945568.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A76 3040 bytes
SHA-256: 2e0406d255433b7eebed61740af08eeac889f34a8ac1216fd4a6af0e74f6f423
font_01_sfnt_off00007564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7564 5000 bytes
SHA-256: db9dfff316478561d851010391e88b65def87f213558ce63a8197668b7bf50ec
font_02_sfnt_off00008654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8654 11748 bytes
SHA-256: 52e7e47db6a670a52d2adfdb008c41a39fc5c2e8f3b0fc26735ea725e0e7421f
font_03_sfnt_off0000acaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACAF 16192 bytes
SHA-256: b8987608e74429a43279b631473b10a6179940079cd95b4bb6a6b0e3dc58894c

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