Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a3ca912f4d0718…

MALICIOUS

PDF

57.2 KB Created: 2020-08-08 13:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2e32d4b1ed4371449434b96263e3dcf SHA-1: c79a308929bc0d4c35f8b47f6e044bc339fae462 SHA-256: a1a3ca912f4d071834e38b20d019a6c8cc2a99fd1d209f82876d42dac67cd581
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm, aiming to improve search engine ranking for the malicious content. The primary malicious URL identified is https://ttraff.ru/pify?keyword=comparative+and+superlative+adjectives+and+adverbs+pdf, which likely serves as the initial entry point for further malicious activity.

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=comparative+and+superlative+adjectives+and+adverbs+pdf
    • http://files.episcopalcommonprayer.org/uploads/1/3/1/1/131164130/9303f75bc111bb0.pdf
    • http://files.drleeinfo.com/uploads/1/3/1/3/131379409/jelotanazogodon.pdf
    • http://files.kb-marine.com/uploads/1/3/2/7/132740665/8047495.pdf
    • https://cdn.shopify.com/s/files/1/0447/2075/0745/files/ain_t_misbehavin_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4074/files/29859826873.pdf
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/bash_shell_scripting_tutorial_point.pdf
    • https://cdn.shopify.com/s/files/1/0427/9776/0668/files/65252914017.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/36533429808.pdf
    • https://cdn.shopify.com/s/files/1/0433/6346/7414/files/nesirapukugiwi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/stardew_valley_how_to_mod.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/83703253309.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/62446672772.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/monavojoxutitoxefokef.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/use_of_cloud_computing_in_business.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/cube_world_real_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/xanij.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/firajukoxol.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_off0000991a.bin
a223eb7d4cde5d30b41635a18e8648e440b2cb4e059d2160a2c0158e25a34b8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x991A 5480 bytes
font_01_sfnt_off0000aba8.bin
e4c93e99773b7439c16edad11206e0286b4c03c9029fdb5c314e52b82c55194b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABA8 13936 bytes

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