Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16bb8c04f4a6a77…

MALICIOUS

PDF

56.1 KB Created: 2020-08-30 06:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f1b3a71132bb35ac3e5430c63f80eb00 SHA-1: 7cf57a9806b5fb26c56f4be2852b1eab475e240b SHA-256: a16bb8c04f4a6a7747db05f79a942b92c7aecc2b5739aea63bbaebb010f6d5c3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains embedded links that lead to a redirector URL, which is a common tactic for distributing malware or phishing pages. The ML classifier strongly indicated maliciousness, and the PDF structure includes a link farm, suggesting an attempt to manipulate search engine results or distribute content widely. No scripts were extracted, but the presence of malicious redirector links is sufficient evidence of 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.me/wix?keyword=sketchup+32+bits+2018 In 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://static.usrfiles.com/ugd/b8c837_e6354e190b664a148bc5c68eb631d4ac.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/c8a981_4a21cc074a934a4ca5ce42dcd96d7c58.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/23e9be_15c37a8ccc1a4c54ab9103613b91ef3c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_777f775b845b4d4dacec14420ea13f7f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/4dd980_3935558b4130442e9e3ed2cb4bf1f9c5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8133/4935/files/24101322724.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b916f4_a302bf6e73fb4c8b9f71ee3c31df73a8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b56239_97b343d50c4a44a19ed8f49d10806d18.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f523c3_9f5862f8a5844e2692c43b50cef043bd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a1fb72_ac7f602acf9145b7967b8cc32c4e72f9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_053808e8de0a4b62b6f65f7f8946bbac.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a382ee_38c5eb448ec94145b11346ed731877e1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E40 5340 bytes
SHA-256: e57669161ab33501db972965eafca51d88ffa5c8742e62b62c2d27ef9ec84078
font_01_sfnt_off00008079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8079 2016 bytes
SHA-256: 63f019dff5fa66ce254f8ec0f5ebdd5c99fc9b2aefd3036a46ce71f5faddaaf7
font_02_sfnt_off000089d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D1 11124 bytes
SHA-256: 35fa61e14111de1996f655029612a279e78661613eaa0015071caa2caec6492c
font_03_sfnt_off0000af83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 16276 bytes
SHA-256: 38627b93cc9f370a31a933e816fb5ddadaa2d4e49c7483e22e5b965209e5b38d
font_04_sfnt_off0000c4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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