Malicious PDF — malware analysis report

Static analysis result for SHA-256 97587fff7b531610…

MALICIOUS

PDF

58.6 KB Created: 2020-08-13 09:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df9e15407ade40c44ca492dc4c30780c SHA-1: 0a9ee7c65e0bd403336b002766a3d2e7a82500e0 SHA-256: 97587fff7b5316101c7b30876d302f90b6ed3ddce69ea9599a3846be4c540592
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of a large number of external PDF links, many pointing to Shopify, indicates a link farm SEO technique to improve search engine ranking for malicious content.

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/pify?keyword=basel+2+norms+pdf
    • http://files.businessmanagementorganizer.com/uploads/1/3/0/9/130969077/765f62582471.pdf
    • http://files.stannersenglish.com/uploads/1/3/2/7/132710783/8472466.pdf
    • http://files.spartanadvantage.com/uploads/1/3/1/3/131380297/4249669.pdf
    • http://files.marti2heal.com/uploads/1/3/1/3/131384663/mebebom.pdf
    • http://files.paulinedodd.com/uploads/1/3/0/7/130775021/sonokorap-vitugefufike-zezeko-wuviwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4343/0305/files/lenimamekamaji.pdf
    • https://cdn.shopify.com/s/files/1/0430/1085/0979/files/diranokitipofelum.pdf
    • https://cdn.shopify.com/s/files/1/0434/7484/5858/files/fluid_management_in_acute_kidney_injury.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/78016326436.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/22650439267.pdf
    • https://cdn.shopify.com/s/files/1/0433/6294/3127/files/bakilijuxe.pdf
    • https://cdn.shopify.com/s/files/1/0434/2448/1431/files/nozinamukabukose.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/wigovavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/zabixegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/kali_rolling_repository.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6211/files/apocalypse_rising_script.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/25307057749.pdf
    • https://cdn.shopify.com/s/files/1/0437/5828/9045/files/how_to_turn_off_avast_popups.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_off0000a6f0.bin
3edf8f76b9c2d2cf065fa31325a4e292fe04deed9e0e2093db534801b31cf817		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6F0 5368 bytes
font_01_sfnt_off0000b913.bin
7cf8f3331e8c58a9c2f4834cd5ee59340b866752a4e8bab4d031cda76c4c3a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB913 10612 bytes

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