Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9107bcb40b2ef0…

MALICIOUS

PDF

41.4 KB Created: 2020-08-19 13:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2915c633a264bbea643ec84c8ae24ed9 SHA-1: 237f996ae81b426f484cf08cf3ee106ee8f9ef0b SHA-256: fe9107bcb40b2ef03bb230deeb6da6699a0534810995bd143aa1f0ed009eeffe
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a PDF link farm. One of the primary links points to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.com/pify?keyword=kunena+forum+templates', suggesting a potential SEO manipulation or redirection scheme. The ML classifier also strongly flagged this PDF as malicious.

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=kunena+forum+templates
    • http://sajuzima.padenpierry.com/uploads/1/3/0/7/130776757/b09f782dc.pdf
    • https://cdn.shopify.com/s/files/1/0435/6397/4805/files/gofexoxafesugowetisujuleg.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/nalixavorasokakap.pdf
    • https://cdn.shopify.com/s/files/1/0437/2738/8826/files/uniform_format_of_accounts_for_central_autonomous_bodies.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6405/files/adhd_medications_canada.pdf
    • https://cdn.shopify.com/s/files/1/0441/1172/4696/files/56644770650.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3239/files/miller_maxstar_200.pdf
    • https://cdn.shopify.com/s/files/1/0436/6571/9449/files/dudexowukamegederejil.pdf
    • https://cdn.shopify.com/s/files/1/0429/1257/9747/files/algebraic_expression_worksheet_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0438/6825/8469/files/livujepogiwipebad.pdf
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/19370497360.pdf
    • https://cdn.shopify.com/s/files/1/0438/8657/5771/files/sociolinguistics_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/7657/3601/files/dakitirije.pdf
    • https://cdn.shopify.com/s/files/1/0435/4267/5608/files/63172295224.pdf
    • https://cdn.shopify.com/s/files/1/0433/6215/6702/files/24318191439.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_off000055d8.bin
91be80b3878a2c5c6c38f932cbb734adc8d4eb930bcff96d22c8fd721aa7e56a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55D8 4848 bytes
font_01_sfnt_off0000663e.bin
656a8a8805c03ba257bd0a7935223cdddf84b88ba00c99716846d91200bdfade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663E 10528 bytes
font_02_sfnt_off00008a11.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A11 4324 bytes

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