Malicious PDF — malware analysis report

Static analysis result for SHA-256 e658c28d995a052b…

MALICIOUS

PDF

43.6 KB Created: 2020-08-30 17:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf1388d245a1ef7a9f1d30fd37cfecf3 SHA-1: 3d68fe94185a56dcd44f4c26ec14698fc35c046c SHA-256: e658c28d995a052be0e3ef69128bf98c0f5c7322cdfce0db8c7aff344fdc73f7
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. This URL is presented within the document body, disguised as a link to download a game. The PDF also contains a large number of external links, many of which point to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly indicates maliciousness.

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=dayz+standalone+dedicated+server+download
    • https://cdn.shopify.com/s/files/1/0437/5393/0904/files/algebraic_properties_of_equality.pdf
    • https://cdn.shopify.com/s/files/1/0437/9777/4497/files/61009164155.pdf
    • https://cdn.shopify.com/s/files/1/0433/8375/0821/files/timesheet_calculator_redcort.pdf
    • https://cdn.shopify.com/s/files/1/0433/0350/1989/files/vexerupojidopenifapiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/free_math_worksheets_for_kindergarten.pdf
    • https://static.usrfiles.com/ugd/834936_5f8d3b4cc7d34da492a3831f3299083d.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_98c8eb4f99f14e00a1c54e5e138f8367.pdf
    • https://static.usrfiles.com/ugd/314c35_080b251ec0bb4bc88107668137e3fd6f.pdf
    • https://static.usrfiles.com/ugd/ce14f3_5bc6e75edd3a477990333654be5203e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_2734c83abdf44af1a55532e2184037fa.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_4c0ba93076b24809b165d9749eeeaf83.pdf
    • https://cdn.shopify.com/s/files/1/0463/2985/6155/files/72650708115.pdf
    • https://cdn.shopify.com/s/files/1/0428/4694/5436/files/tiluxotowijimonekifewi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/96533191587.pdf
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/vesekotanemew.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_off0000647c.bin
eaf280298e7807faece9192a7634b033b8f13e7b5a5903b143fd5659a2afcb5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x647C 5236 bytes
font_01_sfnt_off0000767e.bin
5df1aa221862e6d1eed47cd8d45763dd6c76bada9f4b33bbfb7457ae0c37daff
pdf-font-stream PDF embedded font (sfnt) at offset 0x767E 13372 bytes