Malicious PDF — malware analysis report

Static analysis result for SHA-256 505343c762be9278…

MALICIOUS

PDF

67.8 KB Created: 2020-07-28 18:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32e79260669ee33280f0b1a58c577a63 SHA-1: 2d774f0cebcc231d7691205cc385d11f9bb3fea3 SHA-256: 505343c762be92780549ec0dfa61b14225527b38e15165b7e880b3e975272a55
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify-hosted PDFs, forming a link farm. One of these links, https://ttraff.ru/pify?keyword=50+literary+devices+pdf, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but the presence of the link farm and the malicious redirector strongly suggests a phishing or malware distribution attempt.

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.ru/pify?keyword=50+literary+devices+pdf
    • http://files.stitchngostudio.com/uploads/1/3/1/8/131856624/winezofumuxeru.pdf
    • http://files.connectatc.org/uploads/1/3/1/1/131163533/xonunurumateminavi.pdf
    • http://files.hanoverteachers.com/uploads/1/3/1/6/131606968/239dc94b99295fa.pdf
    • http://files.mclean-steel.com/uploads/1/3/0/8/130873947/wimadizuvitipebonome.pdf
    • http://files.fenwickberryfarm.ca/uploads/1/3/0/7/130775431/kawetowixet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2387/5746/files/xoborurazajukogal.pdf
    • https://cdn.shopify.com/s/files/1/0428/1355/4855/files/51553234000.pdf
    • https://cdn.shopify.com/s/files/1/0430/0659/1127/files/nizikoganetikutudezesup.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/92335512870.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/mevavojaxowefibuzugakipuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73875000904.pdf
    • https://cdn.shopify.com/s/files/1/0441/0041/9736/files/nitado.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/80866554712.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/fikigipofexaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3171/4202/files/4748978806.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/kusaxasamotesigoguburiruw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3019/9966/files/8757937677.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/18007872131.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_off0000b6f0.bin
820151e5b1f9ad807bb18f1424edad5695af99deaa81a4d02ee0feb246a696a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F0 5052 bytes
font_01_sfnt_off0000c840.bin
777af96b196022d8d62b6a9020a61734b188a9ac73588386bb015f44513bf322		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 10208 bytes
font_02_sfnt_off0000eb59.bin
45cb6eda08d6ac80fb52d5232397a656fcd4704205f5c06cb3b85b823cab4515		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16524 bytes

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