Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf94250c85e50d8…

MALICIOUS

PDF

52.4 KB Created: 2020-07-27 22:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4c21c205816a3a6b864c4148b935ca7 SHA-1: 607969162e1150c24fde0eb36be3cc3baada7843 SHA-256: acf94250c85e50d82de6bceaebd94059f1f783f8595e8a0d8d2e3845f1c2ffb8
154 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=maintenance+service+plan+template'. This indicates a phishing or social engineering attempt, disguised as a 'maintenance service plan template' based on the document body and URL parameters. The file also exhibits characteristics of a link farm, with numerous embedded links to other PDFs, likely to obscure the malicious destination. 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=maintenance+service+plan+template
    • http://files.thecostaricakid.com/uploads/1/3/0/7/130775627/kasin.pdf
    • http://files.domaszeromskasmusic.com/uploads/1/3/1/1/131164440/dokid_lovuwedokam_vedetuxuxefofuf.pdf
    • http://files.stijndecock.com/uploads/1/3/2/6/132681619/d38c1eb5c1.pdf
    • http://files.everlastinglovechurch.org/uploads/1/3/1/6/131607522/e6e1aae7.pdf
    • http://files.frenchsommelier.info/uploads/1/3/1/3/131379510/vofizimalofumegepaku.pdf
    • http://files.frenchsommelier.info/uploads/1/3/1/3/1313795
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/popaledegele.pdf
    • https://cdn.shopify.com/s/files/1/0429/5534/1977/files/wugave.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0438/files/jigotawuxikavuta.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/vujogarofifegigugukerup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62894204366.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/9955346224.pdf
    • https://cdn.shopify.com/s/files/1/0438/1445/3410/files/63640430332.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3483/files/zoxemuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2426/1026/files/sabojinaleso.pdf
    • https://cdn.shopify.com/s/files/1/0435/7508/3171/files/86192638297.pdf
    • https://cdn.shopify.com/s/files/1/0439/3671/0824/files/xenenodoma.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_off00008e85.bin
ea29240bad27f31ba1f0605d663075f009d26f3d5e4d60637c391d9b5d0a59c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E85 4820 bytes
font_01_sfnt_off00009ec8.bin
94c4f7ea16714ce21d738576be4342ebd02bfebed454d96f661ad447f4ce3ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EC8 10996 bytes

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