Malicious PDF — malware analysis report

Static analysis result for SHA-256 db97580d1899ce62…

MALICIOUS

PDF

47.9 KB Created: 2020-08-02 22:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 144079b728b150a8156a11243c173eb0 SHA-1: e475fcddba3539c071cd20937218d702cfba52ab SHA-256: db97580d1899ce62e77ef797b92f79c2fa4a497c06d86eeb980ca7a04561cb2e
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure (ttraff.com). The document body also contains a reference to 'Linkedin. com/ feed/', suggesting a lure to trick users into clicking the malicious link. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm designed to obscure the malicious destination. No scripts were extracted from this sample.

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.com/pify?keyword=linkedin.+com%252F+feed%252F
    • http://files.sarasotacountysurplusproperties.com/uploads/1/3/2/8/132814415/7419555.pdf
    • http://files.solutionstailored.com/uploads/1/3/1/4/131453712/2607489.pdf
    • http://files.eastbrooklynhousing.com/uploads/1/3/2/6/132681194/nusamek.pdf
    • https://cdn.shopify.com/s/files/1/0428/5235/2156/files/12844903043.pdf
    • https://cdn.shopify.com/s/files/1/0430/6056/0021/files/sonof.pdf
    • https://cdn.shopify.com/s/files/1/0435/5411/1656/files/filesekilubakumexesitoti.pdf
    • https://cdn.shopify.com/s/files/1/0437/7175/6698/files/vmware_workstation_15_pro_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0429/3958/0575/files/39126362839.pdf
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/norewomipumuruwunipeduvup.pdf
    • https://cdn.shopify.com/s/files/1/0432/2187/6900/files/77965791249.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9742/files/diwewit.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/fuxisewopukewugapurugiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/7487/9641/files/14718230626.pdf
    • https://cdn.shopify.com/s/files/1/0431/8144/1181/files/59593199501.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/givewosuxarazomomiparilu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000729b.bin
c7f6310b348c0c927f46d805770ac24cf47729a1e7686a0bf0a8ab58f32eefa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x729B 4432 bytes
font_01_sfnt_off00008193.bin
076bca30fdc43e4c8e5a2b60b89c3132a389b63e137f7b6e7ab0ab06a95108fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8193 10096 bytes
font_02_sfnt_off0000a40d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA40D 4324 bytes

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