Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e4e9b17869309e…

MALICIOUS

PDF

56.8 KB Created: 2020-08-30 00:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6879b5d4d6a13c26bf6f262c3d78482b SHA-1: 0a64bb6f1f0524f91c52d0add6f9af44127269bb SHA-256: 41e4e9b17869309e632480be2e1acb0a2f2bafd72e896b5b13865b4586c3446a
194 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=a+first+course+in+probability+9th+edition+pdf+free+download'. This URL is presented within the document body, disguised as a link to download a textbook. The file also exhibits characteristics of a PDF SEO link farm, with numerous links to external PDF files, many hosted on 'static.usrfiles.com'. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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.cc/wix?keyword=a+first+course+in+probability+9th+edition+pdf+free+download In PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b0b521_f7edc04f93b14bd4b8cd6df5aa5f4d11.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_31facdb28ae3470c841cfb5e3d84d451.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cf79db_c37bf477c4344fe885a3b1cf936eb32a.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cf79db_e5230e54806a484ca49cbf4f26a450d4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2f7e1_4087146ff92d46fa8036103dbd3800c1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a1befd1435fb456193bef9b441353e4c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_4a5a2267bc9740bb8cd25fe7ebae15f5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_e02019584a954817afa1533844b0729b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3b0c81_3232490750b447e8b2faa2fdf26dfbac.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_1912008e4c8546aa9b30955685f1136e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0c268c_f1b0c58ffdcc4a7da4b8685fd8baafe2.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_97715f0395ef4dd58396046bfa7ab6f4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_03d499f51e7b4a1eb8ad2d3b9e66bfb0.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/69b86f_e9f22e3c997c4bdbb71628cfde73274c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_d5015d7093324947bdb15965c442a8df.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ff99d61fcb7346d69b9b03948866c7bd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_2834bcfd68bd46e392f192ff386ad85c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/49be48_80addb10393e4008a47b30c629f526d9.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 1

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A6 1736 bytes
SHA-256: 2386068f7a73a9f1c684ba6296c5021819071ca54571ed7fff7ef555150aac7c
font_01_sfnt_off00007c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0D 5720 bytes
SHA-256: b3d10dd61d050bdbc5566bdf0150f086db38e1d4ce07b4812dcca5f5b4d4241b
font_02_sfnt_off00008f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F88 15236 bytes
SHA-256: 4bde56ef05c8db19da3fc7af8bfa41c5671d5d35e8905afa1219251dce202267
font_03_sfnt_off0000bfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 16140 bytes
SHA-256: 01b046ac3d3bdb9099885b0d611edf51531dfad14e3bdf91fc6f50a794df71fe

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