Malicious PDF — malware analysis report

Static analysis result for SHA-256 721945f4dd41e983…

MALICIOUS

PDF

34.0 KB Created: 2020-08-20 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a94aa79e4fb33fc498b5b7e17f0f400f SHA-1: 1348902980e09adf809d819d1128b385a5414e74 SHA-256: 721945f4dd41e983019add832646a30577552ef9b7f36a8ca52d073f5e21df2a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with a primary link pointing to a known malicious redirector. This redirector is likely used to funnel victims to phishing or malware download sites, disguised as a free download. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent.

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=d%2526+d+beyond+wizard+guide In PDF document text
    • http://biwema.richwayspirits.com/uploads/1/3/1/1/131164250/26441822f.pdfIn PDF document text
    • http://files.godsgracehawaii.com/uploads/1/3/0/8/130815228/9920326.pdfIn PDF document text
    • http://files.autismhomebase.com/uploads/1/3/0/7/130739052/f2ea4d375f3.pdfIn PDF document text
    • http://xusotu.vanpickuppr.com/uploads/1/3/2/6/132682565/sowekeri.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/1/0437/7421/4306/files/5164016370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/lofegugegedumixujuzedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1783/7467/files/42144354281.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1625/6677/files/22305830070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3850/6146/files/adobe_after_effects_tutorial_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2890/4093/files/29880525659.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/bisedopuriduwodubijixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/72539499150.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2960/2205/files/29687149336.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3846/6471/files/spoken_english_malayalam_file_download.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_off00004afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AFA 4156 bytes
SHA-256: 491d847b6606b2aeef656f0a947dbdea29e01eb243e8a29fdb65c017b6eb5ea4
font_01_sfnt_off00005928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5928 10208 bytes
SHA-256: bd62278c8288927f1c3a2954990ddcdd45713b67e4625e621899ba7d12846065

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