Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7a8b0185384e3a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-10 05:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 366b2e5b2b1c32822424b20b8791cb7a SHA-1: 857907652fa860c677ed9c24f6e2e4e17c0a0cf5 SHA-256: fc7a8b0185384e3a27e719637043b9b9b1b335bf761d1069285fbc490d67b56b
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service (ttraff.cc) which is flagged as malicious. Additionally, it hosts a large number of external PDF links, many on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains text related to 'conjuntivitis bacteriana en perros pdf' and the wkhtmltopdf tool, indicating a potential lure to disguise the malicious intent. The ML classifier 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.cc/pify?keyword=conjuntivitis+bacteriana+en+perros+pdf
    • http://files.cruxdesign.net/uploads/1/3/0/8/130814021/bibodesurisogefegefo.pdf
    • http://files.taylorelectricmt.com/uploads/1/3/0/7/130776632/tobipepotixodit.pdf
    • http://files.formaliz3d.com/uploads/1/3/0/7/130775515/natekowiv_depejojezabi_semapuginudemu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/69489927889.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0763/files/pexaxuzetotuwedikarepew.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/archimate_metamodel.pdf
    • https://cdn.shopify.com/s/files/1/0432/6565/4939/files/91200601340.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1513/files/zemogifeviwazoziwizeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/is_touchcopy_safe.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/definition_of_antioxidant.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/6307675198.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9308/files/c_vector_class.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96951977507.pdf
    • https://cdn.shopify.com/s/files/1/0437/8089/8973/files/brand_image_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0437/1759/1189/files/kelibowipupetepoxud.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8627/files/91010906582.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_off00006867.bin
28048bd51c3370b6a71d643da7efd663172ac2f79bc5817cab6b792525e59778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6867 5296 bytes
font_01_sfnt_off00007a81.bin
78a18943e0886753bd3f759d9d9895d7010c5ea06f7776377cd14e5b209a547e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A81 10688 bytes

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