Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a9f243b408d4ba…

MALICIOUS

PDF

40.6 KB Created: 2020-08-09 05:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 3b5eac506d5c37feb8cf84ed4c79afc5 SHA-1: 5935969d55439e72d7085f438d492278b2a2f6ed SHA-256: 18a9f243b408d4ba9c97e6bb036eca3169ef3137ad137c7e2e8a815f6326b44d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body itself contains the primary malicious URL, suggesting a phishing or scam attempt disguised as a free PDF download. 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.com/pify?keyword=tps+book+for+computer+science+pdf In PDF document text
    • http://files.ihmcenterforliteracy.com/uploads/1/3/1/3/131380786/4941664.pdfIn PDF document text
    • http://files.doorbeopen.com/uploads/1/3/1/4/131454116/towalapelajotow-kijupobozid.pdfIn PDF document text
    • http://files.atlantaillinois.org/uploads/1/3/1/1/131163578/9873081.pdfIn PDF document text
    • http://rotaw.theinnerlifebooks.com/uploads/1/3/2/3/132302921/9197220.pdfIn PDF document text
    • http://files.swiptt.com/uploads/1/3/1/8/131871984/dekalikutekuz_wuvepumuju.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/1/0431/1960/7962/files/kapenanitazudesofomiser.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/14123814925.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9223/8745/files/nekizeruvumaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/givopamaxus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4261/9035/files/88500225278.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2541/5843/files/robert_half_salary_guide_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95936092566.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/dobakupotepudaxoxetux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/taxonomy_classification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3646/6590/files/jixalamopufarawi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8630/6710/files/tenemupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/62223849046.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_off000061e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E3 5212 bytes
SHA-256: 8d4233e3f9af5adc42aab627f33f0d6e770ede975ca36c50b6c3afd51c75e83f
font_01_sfnt_off00007388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7388 9980 bytes
SHA-256: b8c06b3242cec57a7ece48437722d881c0e7d4c8a373736615793f0c574821cf

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