Malicious PDF — malware analysis report

Static analysis result for SHA-256 429508f8e6f7b809…

MALICIOUS

PDF

50.9 KB Created: 2020-08-21 08:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5e12d6572961dec2c6ef23e8f4d90bc SHA-1: 59dd3f45b8bee6c5df127dfe2516117f456fff6f SHA-256: 429508f8e6f7b809bd9f2754a0dd6549ded52b438e7cc8f2680c4c814ce8ed30
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is used in conjunction with a lure related to 'Java freshers interview questions and answers' found in the document body. The PDF also exhibits characteristics of a link farm, with numerous external links, including one to 'cdn.shopify.com'. The ML classifier 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.com/pify?keyword=java+freshers+interview+questions+and+answers
    • http://niziri.thelellowfoundation.org/uploads/1/3/2/3/132302868/d7af05eacc14.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/fitatesufovenoti.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6580/files/line_graph_template_printable.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/arbonne_protein_shake_nutritional_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/zebesijevela.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/reticular_formation_meaning_psych.pdf
    • https://cdn.shopify.com/s/files/1/0437/5727/3237/files/subordinate_conjunctions_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84312174386.pdf
    • https://cdn.shopify.com/s/files/1/0431/1931/3053/files/xewin.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_off0000893a.bin
bf7a1e658c2f56f423d0110f0c1d059c97448f75ab288fd5633b731c5f98be74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x893A 5228 bytes
font_01_sfnt_off00009b0e.bin
c6eb71bd9f3ed5a3b696172dbac9b1ba72ecc3a74ae97e6b92a8582ed31a5b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0E 10680 bytes

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