Malicious PDF — malware analysis report

Static analysis result for SHA-256 78d7c319e7342dc3…

MALICIOUS

PDF

38.3 KB Created: 2020-09-02 06:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b176d329c89d860d0962093017242bd SHA-1: e98d6476142478738da5e7ffea0d7a8d22135195 SHA-256: 78d7c319e7342dc35a3295663f2d3e88ebb6fb170b71a83724af38836138cc22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=le+faire+chalice+guide'. It also exhibits a PDF link farm heuristic, embedding numerous links to PDFs hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other Shopify-hosted PDFs, suggesting a lure to a malicious site.

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.cc/wix?keyword=le+faire+chalice+guide
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1127/4914/files/krohne_coriolis_mass_flow_meter.pdf
    • https://cdn.shopify.com/s/files/1/0435/7357/5841/files/69911350568.pdf
    • https://cdn.shopify.com/s/files/1/0430/9339/3557/files/60467982702.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/93591728750.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/90499495856.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/joindre_2_fichiers_en_1_seul.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/best_graphic_action_games_for_android.pdf
    • https://static.usrfiles.com/ugd/b8c837_32bc560b756d44e78d1964fecf29cc72.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_6f22702e6f6645c9ab85670d01e4bb3c.pdf
    • https://static.usrfiles.com/ugd/60933b_043bb4e8e4a74ca49d4f96bd93e59a00.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8373fc8801e47aeabcc6c0299ed8792.pdf
    • https://static.usrfiles.com/ugd/80bfa9_b8d4d85ce4424cf495fed071689c233a.pdf
    • https://static.usrfiles.com/ugd/1e4819_e949e3e9e9ab4df8849205ded49cc384.pdf
    • https://static.usrfiles.com/ugd/6908d7_348590dfd2174324acef49f7df7d78ba.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_off00005aa2.bin
b0444114a7a22abcf6713a4fbe553dc26793af3ddb21d5cbcf04c8da26fe42e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA2 5048 bytes
font_01_sfnt_off00006bca.bin
34537a0de900db012f499e5a69e4d92601f644a2c1e6260dc020b9e97e370b1f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCA 9612 bytes