Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dcd58557f5622d…

MALICIOUS

PDF

41.9 KB Created: 2020-08-09 06:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5c35de8849bad4699b4983b5f488b265 SHA-1: f547f6eb6f9b3d2c58722dd9f06c60675ee703bc SHA-256: b5dcd58557f5622dd3566e9b93a2bced3d5750f4dbefa65ab149ed8e2f51649b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this is a PDF link farm, likely designed to either distribute malware or engage in SEO manipulation. The primary malicious IOC is the redirector URL, which is used to obscure the final destination. 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.ru/pify?keyword=granger+causality+test+eviews+pdf In PDF document text
    • http://files.premierebasketball.com/uploads/1/3/0/7/130775658/e64deae95b2b.pdfIn PDF document text
    • http://files.midwestbooksellers.org/uploads/1/3/2/6/132681670/juruj.pdfIn PDF document text
    • http://files.liquidgoldbfs.com/uploads/1/3/0/9/130968933/rexopabe_ripawonagokal.pdfIn PDF document text
    • http://files.snap-scaffoldingfornumericalsynapses.com/uploads/1/3/0/9/130969440/2528393.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/wevanedinuwisuvajolow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1838/6588/files/associated_press_stylebook_2015_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/feline_calicivirus_treatment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5177/7185/files/mokefasetobapiterol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7714/8571/files/kexozopebinavomiraluja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/63269154894.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4908/2264/files/47252378195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/samigefataduxiru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/fomotolobakutijusedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/gapunemoxegasifuwanaliz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7595/1005/files/aditya_hrudayam_in_telugu_with_meaning.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_off0000663c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 5608 bytes
SHA-256: 66209ec3c71cf9132aad653887158df0053dead03c4f1f7571a3a5fb57298ce1
font_01_sfnt_off0000797f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797F 9688 bytes
SHA-256: ec8f53f8e4a627d99bd2a17de22fa3d2b2034d147cccd4deea37c9e229686a10

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