Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc9c27c4cea8176…

MALICIOUS

PDF

42.6 KB Created: 2020-08-14 20:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b42bdba881a455d041061b63f1536f93 SHA-1: 4136ee3bfa518a1b6f41ebd5f0021fc84c851aeb SHA-256: 1bc9c27c4cea81764bb393d7387d04d27869ef3f1987ac05a9356f5ac4fda66c
150 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 of which point to external PDF files hosted on Shopify and other domains. One of the primary links, 'https://ttraff.ru/pify?keyword=best+android+blood+pressure+monitor', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting a lure to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=best+android+blood+pressure+monitor
    • http://sujugimut.adultgleeclub.com.au/uploads/1/3/0/8/130874493/3965742.pdf
    • http://lozigap.janewman.com/uploads/1/3/1/3/131379706/faxoke.pdf
    • http://files.anaestheticchecklists.com/uploads/1/3/1/8/131857723/tatuwojanigiganopa.pdf
    • http://files.workinnvision.com/uploads/1/3/1/3/131384018/zudemesenodevakani.pdf
    • http://files.passionartculture.com/uploads/1/3/1/3/131397946/wazajavu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1823/0688/files/51402309477.pdf
    • https://cdn.shopify.com/s/files/1/0429/7523/2153/files/pisavopesodoxofojeratoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/back_end_programming.pdf
    • https://cdn.shopify.com/s/files/1/0430/2703/8359/files/4473415463.pdf
    • https://cdn.shopify.com/s/files/1/0434/8231/6957/files/advanced_engineering_maths_ka_stroud.pdf
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/xovejebonaka.pdf
    • https://cdn.shopify.com/s/files/1/0436/9842/1913/files/80595862535.pdf
    • https://cdn.shopify.com/s/files/1/0448/6466/7810/files/1-_99_magic.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_off00006a02.bin
136ba23ada22fbc1d0a71f4aaa393725ee91ad0e465882f2a0bbb494ac296cbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A02 5296 bytes
font_01_sfnt_off00007bd8.bin
4ef79642a1269ce5e78576052bffe8e1647982530c376d7498e93d556d67d414		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BD8 9980 bytes

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