Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf93b13e3b3cfca…

MALICIOUS

PDF

31.4 KB Created: 2020-08-15 23:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: def327d00557e4d9441f175a066efafc SHA-1: 2490d3a8486759156f8c0d22a571607d690beef7 SHA-256: 9cf93b13e3b3cfca2f3790e2277ddc51a80d33cd224cc6bb1e28861f4860c368
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely designed to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=relative%20sizes%20of%20earth%20sun%20and%20moon%20ks2%20worksheet
    • http://files.anatomyalchemy.com/uploads/1/3/1/8/131871705/345013a61b2331.pdf
    • http://files.oldpueblosoapery.com/uploads/1/3/2/6/132682913/zibudupin-nazozupibarotub-vofunufuk-nirejexitupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/9821/7374/files/xikasusofaka.pdf
    • https://cdn.shopify.com/s/files/1/0449/1545/8215/files/free_employment_contract_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/86475923119.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/vapatutofemedevus.pdf
    • https://cdn.shopify.com/s/files/1/0427/4785/5004/files/convert_radians_to_degrees.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/2007573522.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/zugopogofog.pdf
    • https://cdn.shopify.com/s/files/1/0430/3234/6773/files/94133456825.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/fairy_tail_episodes_list.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_off00003d91.bin
74ac5418a6ea86ab759ea343511eee69fccd0d18f12eb61a37bc5c06646b3d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3D91 5552 bytes
font_01_sfnt_off0000505f.bin
f8d870cde67b8f41601c81ac8b62ab7be948e7d8bc6f04949dbd67a2557cb748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x505F 9516 bytes

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