Malicious PDF — malware analysis report

Static analysis result for SHA-256 a132d5506b721ddc…

MALICIOUS

PDF

45.7 KB Created: 2020-08-11 15:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: 9f8fd97a3bbeff96a5d72b07c48ee078 SHA-1: 676d992f2dae94fc64cf9e3dc1e68ddd53ed909b SHA-256: a132d5506b721ddcc25cf947cc6cc0a9b10625c5cfdb875444d90c5f688238b3
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, indicating the document's primary purpose is to redirect users to malicious sites. The presence of a large number of external PDF links, as noted by PDF_SEO_LINK_FARM, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=black+s+legal+dictionary+pdf In PDF document text
    • http://files.opulashbeauty.com/uploads/1/3/1/3/131380128/1047134.pdfIn PDF document text
    • http://files.ellendonaldson.com/uploads/1/3/1/8/131856146/tetoj.pdfIn PDF document text
    • http://files.magistrasolomon.org/uploads/1/3/1/3/131380625/f4b81c3e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/peter_drucker_managing_oneself_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/sadebuvisumikuxaxugij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5588/3175/files/36977256163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7656/6684/files/40154220430.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/27591947279.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/83780416039.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9696/4261/files/zetapexafesijuxikowof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/avocado_nutrition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6743/1329/files/largest_city_in_alabama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7568/2972/files/bosch_maxx_4_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6618/7176/files/2000_toyota_tacoma_repair_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000655f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x655F 5324 bytes
SHA-256: 657f500613042ca4cd00da0617826f085684e29f9bdea63240ae074d2edfa08e
font_01_sfnt_off0000778a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x778A 10896 bytes
SHA-256: 672952d334874e775e0d8513df90784c96cbe597aae733f339ed96bb5232d7eb
font_02_sfnt_off00009c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C01 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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