Malicious PDF — malware analysis report

Static analysis result for SHA-256 877beebc03968bac…

MALICIOUS

PDF

34.7 KB Created: 2020-08-11 06:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d100f7992977e71ef2091d9b547fe13c SHA-1: 2a3ad26fd979771687771e72d2e3b0c015d513c6 SHA-256: 877beebc03968bac23a263e8d75c7163e7f54ab62e6387b2f5f4e3ab131b0569
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service that is flagged as malicious. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a study guide, suggesting a phishing or scam attempt. The ML classifier also strongly indicated maliciousness.

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=cambridge+igcse+computer+science+study+and+revision+guide+pdf In PDF document text
    • http://files.fullpotentialfitness.net/uploads/1/3/2/6/132695572/wawisimabipudiz.pdfIn PDF document text
    • http://files.hemspase.com/uploads/1/3/2/7/132740805/6c99242c5d670b.pdfIn PDF document text
    • http://files.heathermclaurinart.com/uploads/1/3/1/4/131408432/kusuwojibisi.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/botezosural.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8577/4502/files/cpu_speed_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/nunefodolojefetuxid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/nidafutajodunemerisap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7365/9292/files/53514681214.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/pixutojekepapig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/how_to_check_ios_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9452/3552/files/rca_digital_tv_converter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/72734857571.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4814/0949/files/51579140219.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7752/4888/files/kesewox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/sepufad.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_off000047f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47F1 5648 bytes
SHA-256: bcc9bbc6439d500ca89c1117a4ea9b8f7a0b4c8988a83d0281fc7890cb98c2cd
font_01_sfnt_off00005b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1B 10104 bytes
SHA-256: 76428c03c47dd541e5660bfd08e2f0d55a0e2e415f3a92392f133b176db9ad11

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