Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ed3630ac1d75e2…

MALICIOUS

PDF

44.1 KB Created: 2020-08-13 23:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f61f9ee2ff1ae7e328a185608710eda5 SHA-1: 1903c7876a40aea43ad6b52242f01831948e996d SHA-256: 21ed3630ac1d75e2354929b95aeef111f7869f56b556b688a649650e9003198c
194 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with a primary malicious redirector URL. The document body text, though partially corrupted, includes the phrase 'frp bypass apk with pc' and the malicious URL, indicating a lure to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

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.ru/pify?keyword=frp+bypass+apk+with+pc In PDF document text
    • http://files.homehealthandhospiceanswers.com/uploads/1/3/2/7/132712115/namafijom-vamenuxigira-fumebokidilafi.pdfIn PDF document text
    • http://files.wavecrestb209owner.com/uploads/1/3/1/0/131071315/sixej-dexutafixole.pdfIn PDF document text
    • http://files.topviewleadership.com/uploads/1/3/1/8/131871994/vezika.pdfIn PDF document text
    • http://files.spinnakerspiritualdirection.com/uploads/1/3/0/8/130874257/4727064.pdfIn PDF document text
    • http://files.ncappartnership.org/uploads/1/3/2/6/132695470/lumowumexivun_megopadeju.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/1/0429/5029/5708/files/raspberry_pi_hard_drive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/kevano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7803/3303/files/tuvivizivunisawun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/51169805309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2620/3302/files/20789142416.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/mabon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/kibudalobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2603/7411/files/13874147253.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6870/0310/files/vezurazipune.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_off00006ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB4 5344 bytes
SHA-256: 661eada3a4d49d290c74cf5ceab665de4fd83ba07bf8527db5b6d79727b6b7a3
font_01_sfnt_off00007cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CEA 12152 bytes
SHA-256: 5bc9c0987b858d4836a87b5885e4a3f2a0b4c2add7a206a63f113ea9495288d0

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