Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a96ac8b3e4dbd3…

MALICIOUS

PDF

47.8 KB Created: 2020-09-06 18:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4635df21c0273e613a44aba0aa7c8951 SHA-1: 4957667ad0d125a912d10aa707c7a3ee3de082e5 SHA-256: 37a96ac8b3e4dbd32232d3a4621a91df33376bd237d0a91540faf20d668ed217
120 Risk Score

Malware Insights

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

The PDF document is crafted to appear as an Android developer job description, likely as a lure. It contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.club/wix?keyword=android+developer+job+description+for+resume'. Another heuristic indicates a large number of external PDF links, suggesting a link farm. The document body, though partially corrupted, contains the lure text and the malicious URL.

Heuristics 3

  • 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.
  • 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.club/wix?keyword=android+developer+job+description+for+resume
    • https://cdn.shopify.com/s/files/1/0430/6770/3450/files/58306248924.pdf
    • https://cdn.shopify.com/s/files/1/0448/5156/0609/files/furoxukimupo.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/1547787460.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/98286080112.pdf
    • https://cdn.shopify.com/s/files/1/0466/6631/7989/files/netflix_error_message_failed.pdf
    • https://static.usrfiles.com/ugd/47e66e_cd0fd5413d094728b316c3dc288a2371.pdf
    • https://static.usrfiles.com/ugd/451461_5915383cddf74a2a8bbfc5d29c9afe2e.pdf
    • https://static.usrfiles.com/ugd/09c3c7_5f8d699be5ee4aedacc96e69c76ff04b.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1823/files/72083543707.pdf
    • https://cdn.shopify.com/s/files/1/0459/6619/6903/files/descending_order_worksheet_for_ukg.pdf
    • https://static.usrfiles.com/ugd/dcbeda_b658131d14244406a0220ca97f8421af.pdf
    • https://static.usrfiles.com/ugd/1fbf8b_52265de354e646f0976815bb473d6eb9.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_off0000748e.bin
1f23dc74416e1d21221dc99833c33002ff407e209ee9db798e5162f974184142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748E 5356 bytes
font_01_sfnt_off000086ba.bin
21fba50261ae9b92434a77c12339db52c279ceca77d347a28553e680bde27779		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86BA 13608 bytes

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