Malicious PDF — malware analysis report

Static analysis result for SHA-256 e461bbdc8aae067b…

MALICIOUS

PDF

36.5 KB Created: 2020-08-24 12:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b748de13c94661c87050343e4ea4b5 SHA-1: e0623931bb13449ededbf49a89c9dd2b3ecd9c25 SHA-256: e461bbdc8aae067b276cf98422296989eba462f2437e875bbd2cdafdeeae148e
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. Crucially, one embedded link redirects to 'ttraff.cc', identified as malicious infrastructure. The ML classifier also 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.cc/pify?keyword=avent+naturally+express+manual
    • http://files.uccoh.org/uploads/1/3/1/1/131163684/kosebileseni_lewowuwedag.pdf
    • http://piwabuna.dissertationmumbai.com/uploads/1/3/2/6/132695615/jafuwup_zipefeparad.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/classifying_real_numbers_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6939/1527/files/musufebawaxojij.pdf
    • https://cdn.shopify.com/s/files/1/0437/4442/8181/files/bebose.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/96173939483.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/36075099585.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/dazupobegizubaxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5471/9395/files/fusatog.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7616/files/69900804789.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7174/files/70492724272.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000045a4.bin
d97274f8c862b4e0c264b4d5780357fe08a5b3492f1cf65e7542244736bfeb4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45A4 4908 bytes
font_01_sfnt_off00005641.bin
c45c5ebc5da9235ca58d13ec640089fbb5ed75ff106101c990b4f268c7d0a21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5641 9708 bytes
font_02_sfnt_off00007732.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7732 4324 bytes

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