Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c7ef6f1b30e778…

MALICIOUS

PDF

47.4 KB Created: 2020-09-01 02:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ccf09ec2733e8c97a9b2a6a8be40ebc SHA-1: fbd2b538f7ae0fabaa3d34702398970fc815ef42 SHA-256: a4c7ef6f1b30e7788fdff709c0808a601357d8547d86fa030067905d2c5d2daa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a deceptive title and embeds a link to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, and 'PDF_SEO_LINK_FARM' indicates the presence of numerous links, likely for SEO manipulation or to obscure the final destination. The ML classifier also strongly flagged this PDF as malicious. The embedded URL 'https://ttraff.ru/wix?keyword=answer+me+in+spanish+formal' is the primary IOC, leading to a link farm.

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=answer+me+in+spanish+formal
    • https://cdn.shopify.com/s/files/1/0437/3273/0017/files/marieb_anatomy_and_physiology_lab_manual.pdf
    • https://cdn.shopify.com/s/files/1/0459/2445/0471/files/23878407617.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/27509679327.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/28828245663.pdf
    • https://cdn.shopify.com/s/files/1/0431/5021/3274/files/spread_shotgun_wing_t_offense_playbook.pdf
    • https://static.usrfiles.com/ugd/b8c837_ec75e064e67140e6a819ade02fb77d06.pdf
    • https://static.usrfiles.com/ugd/eaf48f_8659cb52924349258c6a69afeee2382e.pdf
    • https://static.usrfiles.com/ugd/6cfc61_118728b5e18e419eaf974820dd43cdb6.pdf
    • https://static.usrfiles.com/ugd/89064d_b15b2cc5ed644ce98d04922a7f898c1d.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/9790916903.pdf
    • https://cdn.shopify.com/s/files/1/0431/3684/3933/files/19171831743.pdf
    • https://cdn.shopify.com/s/files/1/0431/8402/9854/files/83400393372.pdf
    • https://cdn.shopify.com/s/files/1/0429/5986/3961/files/zafugonaneziferizidimel.pdf
    • https://static.usrfiles.com/ugd/b8c837_66e615173dc842f485a4b6990aa8b426.pdf
    • https://static.usrfiles.com/ugd/1ee69b_7a0fd705451b441783fd635ba95eb8d6.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/
    • https://cdn.shopify.com/s/files/1/0431/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f01.bin
c3b45a90e5e2bfb799838c975d4dcf313cce2b26cdb6c30849e9006315a379e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F01 4932 bytes
font_01_sfnt_off00007f8a.bin
3cef919ee23d129a3dd1285697a4977936002253b7559d750192d3aa78cbbd1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8A 10112 bytes
font_02_sfnt_off0000a20f.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA20F 4324 bytes

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