Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8fbc2915b155a0…

MALICIOUS

PDF

40.2 KB Created: 2020-08-20 01:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8e743e60ba4d4be5361f8174c8919cd6 SHA-1: e9aa39dc7f51f10a0a3dd55229ca4c4b3737d630 SHA-256: 4c8fbc2915b155a0f425158ab18c100b3c82a466c19c1e7e63eaf734d646e5d0
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. Additionally, PDF_SEO_LINK_FARM indicates a large number of external links, likely to obfuscate the malicious redirector. The primary malicious IOC is the redirector URL found in the document body and heuristics.

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.com/pify?keyword=setparametervalue+subreport+crystal+report+c%2523 In PDF document text
    • http://files.torontoacademyofacting.net/uploads/1/3/1/3/131379320/lowaz_bopufigi.pdfIn PDF document text
    • http://vapizowir.realestatesolutions360.com/uploads/1/3/1/4/131408100/pavevirolimu.pdfIn PDF document text
    • http://zevokapuk.tameriamartinezclay.com/uploads/1/3/2/8/132815154/tisonijazimel-tevuwaw-dusabi.pdfIn PDF document text
    • http://files.dimitrovakataacademy.com/uploads/1/3/0/7/130775150/dizizufi.pdfIn PDF document text
    • http://supon.dumperparts.co.uk/uploads/1/3/0/7/130776783/9288187.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/1/0433/6844/8152/files/aranyak_bibhutibhushan_bandopadhyay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/larun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1709/1744/files/jacamo_shirt_size_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2690/6264/files/bali_detailed_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6105/9477/files/galuvubodiledije.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7623/0046/files/chicken_bones_mod_1._7._10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/ccna_1_chapter_6_packet_tracer_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/vizosusejexorikuvara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.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_off00005a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A14 5484 bytes
SHA-256: 271334a0ce94f722d2fe823c4bd31f457804667b7e65e0fd2d93d49c8a85a672
font_01_sfnt_off00006cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAD 12132 bytes
SHA-256: d453e2ceb40b8d44db71644a9718c6460a9e9b109ceebedeb85b8286b3280b8b

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