Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3c6e5dd8bd9396…

MALICIOUS

PDF

40.2 KB Created: 2020-07-27 15:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0be6a9c3d4f0584bde4f3568449ba3ac SHA-1: dbd6f25cc86315e7093e3e41165acc518707c4ce SHA-256: fc3c6e5dd8bd9396626789f5b6d44b61f26e2117bcffe706b07dc40c412b293b
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring users to malicious infrastructure via embedded links.

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=aggression+replacement+training+pdf
    • http://files.cromptonfc.org/uploads/1/3/1/4/131453998/xezisivewusij.pdf
    • http://files.eastcoastinferno.com/uploads/1/3/1/6/131636602/e5787da542.pdf
    • http://files.bshelart.com/uploads/1/3/2/7/132741397/bbcd2276f95856.pdf
    • http://files.pennyanambulance.org/uploads/1/3/1/4/131453124/0009e.pdf
    • http://files.welcometomyhomepage.org/uploads/1/3/2/6/132696048/dukax.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/61144253038.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3887/files/60825593403.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/94592158950.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/57123808918.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/26737935583.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/66799218466.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6390/files/60323098811.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/kadakazalolabesimudovine.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3574/files/87695504814.pdf
    • https://cdn.shopify.com/s/files/1/0430/8582/4164/files/wemakaloperugipikorazubal.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/suxasijabifodolivefinisoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0172/4580/files/79709748382.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/bipinirawasisiwonidomo.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_off00005fc1.bin
06158232ae0580fbf077af8f6ceaef1f093833ef53af975768a3dd1ba06bce23
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC1 5252 bytes
font_01_sfnt_off00007183.bin
4028e0cf070f8dd7328163ebada3308974b5543e6c660dd90feec79f2cf93a82
pdf-font-stream PDF embedded font (sfnt) at offset 0x7183 10024 bytes