Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b3010b59d71161…

MALICIOUS

PDF

136.0 KB Created: 2020-08-09 19:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 18489408afce6716cf4008c876e2a4bc SHA-1: 3618deb1a563bfebffabfcc597161e8d7c627eb8 SHA-256: 21b3010b59d71161faf6ada414a64cc78b79acd679c54e4f5016ad2cd93da058
194 Risk Score

Malware Insights

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

The PDF document was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. It also contains a link farm pointing to numerous external PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a phishing or malware-hosting site.

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=revista+arqueologia+mexicana+cocina+prehispanica+pdf In PDF document text
    • http://files.ledfl.com/uploads/1/3/1/3/131380591/7584970.pdfIn PDF document text
    • http://files.bccupcakery.com/uploads/1/3/1/3/131380504/689727.pdfIn PDF document text
    • http://files.justicefordrew.com/uploads/1/3/0/7/130775196/8618609.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/1/0438/2670/8637/files/cabotage_act_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/libikibezet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/hydrology_and_hydraulic_systems.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8266/1532/files/93621086567.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5827/3185/files/32068337647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/78124093101.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8299/7148/files/bulobule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0965/4436/files/96796714762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/44228221196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0630/4162/files/java_programming_questions_for_beginners.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8827/1767/files/eminem_one_shot_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3959/6454/files/jowilosiputenusofitol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3210/1543/files/8058559463.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_off0001d3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3B6 5832 bytes
SHA-256: 27361a8c039fc10c67cba3f77a4bc5c4988fe537f714ac1e0cd6e230e14407c1
font_01_sfnt_off0001e773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E773 12876 bytes
SHA-256: ba2e98a9299aac16ac52bb129fb827df1412eae1e4be314d927afb06dd8595c7

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