Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad21b30e83a0cb9…

MALICIOUS

PDF

52.0 KB Created: 2020-07-28 08:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7f253c149219e90f299fe0e7602dda67 SHA-1: ba5db71986b36c5353fd5b49c29a590df7bc66d7 SHA-256: 4ad21b30e83a0cb9be06193a4065351d2d3761d672fd88e2c5bb16c48cac5ced
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of external links, a technique often used to redirect users to malicious sites. One of the primary links points to a known malicious redirector. The document body contains garbled text, but the presence of 'Tb pcr test full form' suggests a potential lure related to health testing, which is then used to mask the malicious link farm.

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=tb+pcr+test+full+form In PDF document text
    • http://files.rebeccafalcasantos.com/uploads/1/3/1/4/131407080/3533789.pdfIn PDF document text
    • http://files.matscharcoal.com/uploads/1/3/0/7/130776763/revizezew_naregeleta_lexaxu.pdfIn PDF document text
    • http://files.agrowersgranddaughter.com/uploads/1/3/2/7/132712334/mawofewoje-pibejob-vesidapepexa.pdfIn PDF document text
    • http://files.jamestownlivestock.com/uploads/1/3/0/8/130813644/28ef2f7ede47c9.pdfIn PDF document text
    • http://files.6foot7dave.com/uploads/1/3/0/9/130969731/fezisaluz.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/1/0433/0687/7080/files/dijupabexapuvasazanuripik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/73002354698.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/35300860761.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2146/5757/files/21402837896.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1450/4093/files/72518973881.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/44771722601.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/35729018578.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/22354919245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4553/6419/files/dobewesazinamafeboberexo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/tasagewotasaka.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 3

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_off0000868a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x868A 4768 bytes
SHA-256: 51232cf2cd8223785b23077813daec6869ca2c069c65d774f4197122bd81913d
font_01_sfnt_off000096c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96C5 14000 bytes
SHA-256: d0fed05af642f5fa3c95ec8adb0242622bcacf93017338430d368514f6b388cc

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