Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f780e13d9a9310…

MALICIOUS

PDF

51.3 KB Created: 2020-08-03 11:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 42d6d204d9415c22da481bbde62839af SHA-1: 2c376cee92cba47855cb1021d2dc6f006f0e46e6 SHA-256: 21f780e13d9a93100237937b815610d975ebb8af01accfa27d183365ecb06136
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to Shopify-hosted PDFs, suggesting a link farm for SEO manipulation or to obscure malicious destinations. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. No scripts were extracted from this sample.

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=osu+angelsim+skin In PDF document text
    • http://voletebal.abaofillinois.org/uploads/1/3/1/4/131438464/dizij.pdfIn PDF document text
    • http://files.marlonkellyloans.com/uploads/1/3/0/8/130874284/6965771.pdfIn PDF document text
    • http://files.charlottehager.com/uploads/1/3/1/4/131453432/9cd2b68b7a2e6cb.pdfIn PDF document text
    • http://files.monarchdebate.com/uploads/1/3/0/8/130813931/tuduj-sobakifaju-vuvobevu.pdfIn PDF document text
    • http://files.ashleyknappenberger.com/uploads/1/3/1/6/131637316/wasaferotivelu.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/1/0433/2103/2859/files/jupetunik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8789/6482/files/dusokeworezedulade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/kugozaguvagixedijijubef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2323/5232/files/finuramefo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9776/8614/files/vanawoped.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/13897010054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tadigepulimo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/ranavop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3915/2536/files/63129009137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/35754232533.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/nexur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6519/6197/files/moresizeg.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6206 3016 bytes
SHA-256: cbb52481ce94e16f1aa7c1e5556943e0858c32639ae52c58d7d3596933ba349e
font_01_sfnt_off00006cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC2 5000 bytes
SHA-256: 5a0f266a8c4ef33296df50d4533b7333ed41a1478b6ee5a3a6f7691b1edcd42e
font_02_sfnt_off00007dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DBB 13912 bytes
SHA-256: e5556457ba84be4530f643b14edc0514ee6e685593471a6434e7e893dbd881a8
font_03_sfnt_off0000aa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2E 16192 bytes
SHA-256: 8b7fb3001780e52d9752b4a45056963f66659c4480726df879eeed3b7125700e