Malicious PDF — malware analysis report

Static analysis result for SHA-256 6344a4186643f2e2…

MALICIOUS

PDF

44.8 KB Created: 2020-08-17 02:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 022da7f771f11bfa015f376300b68ccf SHA-1: 58475f0d6a568bae1640ceb8ba41e21499d520c7 SHA-256: 6344a4186643f2e2c17ddbc2145a94dd3edc7d3ae07eadcc6e4f1d1b24cb80c4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, identified as a link farm, with the primary redirector pointing to a known malicious URL. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to disguise malicious content as a legitimate PDF. The ML classifier also strongly indicated 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/pify?keyword=modern+big+data+processing+with+hadoop+pdf
    • http://bewalep.lifeasabowhunter.com/uploads/1/3/0/9/130969634/8942486.pdf
    • http://files.bysamanthajo.net/uploads/1/3/0/7/130740212/xujijaxox.pdf
    • http://files.kurtfit.com/uploads/1/3/1/3/131383743/4066736.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/fuwagetufeziripevot.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/calcitonina_tiroides.pdf
    • https://cdn.shopify.com/s/files/1/0448/3085/1233/files/atomic_structure_and_periodic_table_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/masolonanaxirigaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/74808892106.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1852/files/99486584398.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/jajixewomukiretekinufusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2485/files/6995223747.pdf
    • https://cdn.shopify.com/s/files/1/0427/8904/4383/files/84356327244.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9365/files/12288650474.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/86610203793.pdf
    • https://cdn.shopify.com/s/files/1/0431/3517/2770/files/kewagalekoroxusoratuniti.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/98338348124.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054e2.bin
0b80d4c13ae3eb1a1b95d0d64ea3e36dc799de8d22070d7945e89925f5bb81f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54E2 5620 bytes
font_01_sfnt_off00006810.bin
387878b464b84c8386fecb4af02d045328b86b39c86ccd48a62f84222b0e47c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6810 9740 bytes
font_02_sfnt_off00008976.bin
e5eb930d65907a6ee68c4c0e6a57ffd0e7862a55674a1463eed604c6320a778f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8976 18084 bytes

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