Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9250861c383f411…

MALICIOUS

PDF

49.7 KB Created: 2020-08-22 01:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37d6f3d46b239682d26dc87825d4ce62 SHA-1: 6cbeeb78bfcd7c1116554a3cceb4606a22fff7c5 SHA-256: c9250861c383f411da1f888f32e279fa99e7201d2b50bec4d0fadbf5c94d21b7
152 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its inclusion of links to known malicious redirector infrastructure. The document body and embedded links suggest a lure related to interview questions, which is used to disguise a link farm of SEO-optimized PDFs. The primary malicious URL identified is https://ttraff.com/pify?keyword=midday+meal+supervisor+interview+questions+and+answers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=midday+meal+supervisor+interview+questions+and+answers
    • http://xiripu.downstageimages.com/uploads/1/3/0/7/130739287/6e7ee.pdf
    • https://cdn.shopify.com/s/files/1/0437/6667/7665/files/6583423027.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/64087661544.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2949/files/carter_s_breach_of_contract.pdf
    • https://cdn.shopify.com/s/files/1/0429/0710/7495/files/texas_6th_grade_math_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0438/files/division_tables_worksheets_1-_12.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/90608676701.pdf
    • https://cdn.shopify.com/s/files/1/0432/1057/1940/files/nelisatomorulumogididuk.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_off000084ff.bin
57ab0160d7a3befbf137fea04b50cf7d7e9a5c8030a1293e368b19e8c328fae1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FF 5488 bytes
font_01_sfnt_off000097b5.bin
e84ac62c3f51ccf2970c01fa92cc413fb3464fe4904f3d1f31a03b85aed37c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97B5 10120 bytes

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