Malicious PDF — malware analysis report

Static analysis result for SHA-256 6944deb6342725d1…

MALICIOUS

PDF

55.6 KB Created: 2020-08-30 13:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532739a969175058bf7c83b2cba87256 SHA-1: 248aad143c736d750d6ca14967cb076359da412f SHA-256: 6944deb6342725d1386ebaee597fa75972638fbae0a166631d33607ecc7585bf
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, characteristic of a link farm, with one URL identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings suggest an attempt to lure users to malicious sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.ru/wix?keyword=d%25C3%25A9tendeur+thermostatique+%25C3%25A0+%25C3%25A9galisation+de+pression+externe
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_669cf7f73d7d47788a173a295d4e4d50.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ecdb13adb7c4b1888c2f9531758d173.pdf
    • https://static.usrfiles.com/ugd/8a419d_c00f4677365b47399f3403b06271ac32.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ac3c43eabc7466497d2b29eb1063d4c.pdf
    • https://static.usrfiles.com/ugd/b8c837_abc3e969c28c46319a7b45abb7b66b16.pdf
    • https://cdn.shopify.com/s/files/1/0435/8992/7067/files/engineering_vibration_4th_edition_solution_manual.pdf
    • https://static.usrfiles.com/ugd/ceb2e8_6497eae5316c4d9b91ccacda0352f63a.pdf
    • https://static.usrfiles.com/ugd/cf14a4_faf04e8511fb4ddfbcee0e209d1db41c.pdf
    • https://static.usrfiles.com/ugd/b8c837_d36efc66e1ff4671935da6f60229f0b9.pdf
    • https://static.usrfiles.com/ugd/6290de_b8be590e1953400faf35a0c159629858.pdf
    • https://static.usrfiles.com/ugd/b8c837_39a44fc9681047a7a18a1bb62915b09d.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/fmovies_apk_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5974/files/7248752756.pdf
    • https://cdn.shopify.com/s/files/1/0435/0777/7702/files/57405652008.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007781.bin
567a849269531b5fb5a15c29e84b972acd7c3bcd0fa2aa1e3efc47238ec30cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7781 5940 bytes
font_01_sfnt_off00008abb.bin
fd0a1070a2d1e2fffd4de63161de2ab942c674f89402116bdb71041cf41b005e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABB 15336 bytes
font_02_sfnt_off0000b8fa.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FA 16204 bytes

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