Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9371e8c0533d94a…

MALICIOUS

PDF

34.6 KB Created: 2020-08-17 10:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 4e3915aab8b4f2a45480aa43a2341f9b SHA-1: ae6134a6d806393685fb6d1432dc3f43cea232a7 SHA-256: d9371e8c0533d94af34af403801253750fda6836217815a03fb1fdb1a7d95625
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=doubling+and+halving+worksheets+year+2'. This URL is presented within the document body, disguised as educational content. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify-hosted PDFs. The primary malicious URL is the most critical IOC.

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=doubling+and+halving+worksheets+year+2 In PDF document text
    • http://sodisa.excelbusinessintelligence.com/uploads/1/3/2/8/132814930/ac8751d2f3e26.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/rirolor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3566/4284/files/dojinofu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/estudio_exploratorio_descriptivo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/7108039604.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/rifopololebololoxejal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/kiwubekijopalipe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9222/0840/files/tazibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4962/2431/files/ziduso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5976/3617/files/flash_animation_books_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5516/9182/files/98653401689.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9369/5391/files/28531667833.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6231/9518/files/44695797100.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/30790006891.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 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_off000047a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47A9 5676 bytes
SHA-256: 790b8458124637420613db61718cd3d896be11ae44d749ce7969ca3550c950af
font_01_sfnt_off00005b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B05 10084 bytes
SHA-256: c103906bb0b14983d94db753ba5b80887a10627c17213fabb2d134f3bea46361

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