Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c5aad83392ba5…

MALICIOUS

PDF

35.6 KB Created: 2020-08-30 09:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c604e57abd9d93539f9e22aff4427c4 SHA-1: 08b0feb93c7af15a777159292c7f1a6e74e4ff92 SHA-256: 9f4c5aad83392ba5901da302301becfcf6362496402d1fc09f643de3db09c7ed
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a mass of external links, many of which are hosted on Shopify and appear to be benign. However, one critical heuristic firing indicates a link to known malicious redirector infrastructure at 'ttraff.cc'. The presence of a 'download button' heuristic further suggests a social engineering lure. The document body is heavily obfuscated but contains the malicious URL. The overall pattern suggests a phishing attempt to redirect users to malicious content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=saga+frontier+2+cdromance
    • https://cdn.shopify.com/s/files/1/0429/0392/8991/files/cset_math_subtest_1_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/geographic_information_systems_and_science_download.pdf
    • https://cdn.shopify.com/s/files/1/0461/7981/1481/files/ejercicios_para_terapia_de_pareja.pdf
    • https://cdn.shopify.com/s/files/1/0434/9997/8904/files/32207304129.pdf
    • https://static.usrfiles.com/ugd/b8c837_45cc10e0495148158bd08491093cf7de.pdf
    • https://static.usrfiles.com/ugd/e73fea_c29d85f268da4027b25a105c89645ea2.pdf
    • https://static.usrfiles.com/ugd/b8c837_59fa1813d14a48b384a6d51b8831d1e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4105a9085274f2aa15636327422548c.pdf
    • https://static.usrfiles.com/ugd/516793_337552f541ac45ceac2cab0496cea3ec.pdf
    • https://static.usrfiles.com/ugd/0a052f_2c2ae41674244b05ae39ce7ca05e9f6e.pdf
    • https://static.usrfiles.com/ugd/e8506d_eedf9ce460d34a7ca6cec5458c92f231.pdf
    • https://static.usrfiles.com/ugd/b8c837_897adf9c4edd4691803fa37a7a654b2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c47477d0a47479489360f4e2d25dbbc.pdf
    • https://static.usrfiles.com/ugd/271e65_58c960f3d285428eb2e174da594fa8c8.pdf
    • https://static.usrfiles.com/ugd/cf79db_26191400c2ec4f128faff947d040ac9e.pdf
    • https://static.usrfiles.com/ugd/d775a9_8ec7dd4a7b014f0a9c860a7c37d7fdf6.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d29.bin
b9f3755e903f0729fc3dec548e3efdf2490513901e40e6b653efc6e72cfaa879
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D29 5368 bytes
font_01_sfnt_off00005f4a.bin
0857e723b2b3c3d0531732a5849aca654c7b3431d17b4c65cd712405e5ca30f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4A 10032 bytes