Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d6c171eb358a74…

MALICIOUS

PDF

36.0 KB Created: 2020-08-29 08:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 781af3841585e862f811daef03c79e59 SHA-1: 2ee9865509c84e6d585b8bb374473930f09b4313 SHA-256: 12d6c171eb358a74596b0ee47233cbdbd32931d69e7036e7e1f299a7486d8792
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the link farm structure points to a social engineering or traffic-driving attack.

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=elemental+blockade+vs+unstable+wall
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8079/4780/files/digital_marketing_articles.pdf
    • https://cdn.shopify.com/s/files/1/0434/0927/7095/files/management_of_bradycardia_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0440/3383/5173/files/absceso_hepatico_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0433/7762/3194/files/nebadepigopemadib.pdf
    • https://cdn.shopify.com/s/files/1/0465/9131/2037/files/fazewujububiseso.pdf
    • https://static.usrfiles.com/ugd/b8c837_a94325fa06044123b800983729688ee5.pdf
    • https://static.usrfiles.com/ugd/b8c837_173c99e94a0640a4accc19156c7143b8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e464a8a67a07489fa31bc7d8cdac3a0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_de32a18608624efa924f836a3bfe3651.pdf
    • https://static.usrfiles.com/ugd/b8c837_73307b1636554efd9771da5da787b259.pdf
    • https://static.usrfiles.com/ugd/b8c837_bad97f0b12274ba5a00f058d6c8764b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2be55c7e8b444c1fa019757a913632e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_80af681399124cbe9b894ce3f21d82c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0666e95256234955a04ebe5362be9d6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d7c9aa69c6b6467197863a636d7d41a7.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004dea.bin
2f678342ad9926d33d545148f45707dbce5970d96f27c67293059292f1cf6365
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DEA 5304 bytes
font_01_sfnt_off00005ff8.bin
ae9a59d5bb3f30831a63b04017e949ea9ffb647a58d168d99c912e1fd8b882c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF8 10324 bytes