Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a300655b4ac6c4b…

MALICIOUS

PDF

47.3 KB Created: 2020-08-25 09:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41a2279d9ce4e6631372e30b413a763f SHA-1: ec95777bdb5d11f2075cf32cf021168f39a4541f SHA-256: 5a300655b4ac6c4b646f419f86c683e8b41595159f12a7e08e503255468b7cec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://ttraff.ru/pify?keyword=choices+latest+version+apk, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other Shopify-hosted PDF links, reinforcing the lure. 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.ru/pify?keyword=choices+latest+version+apk
    • http://files.quintetbenefice.com/uploads/1/3/1/4/131453990/vidaraf.pdf
    • http://files.coastalphotoclub.com/uploads/1/3/1/1/131163564/8046763.pdf
    • http://nupovi.allendaleunionchapel.com/uploads/1/3/1/3/131384306/lazodenop-betuxivesemosax.pdf
    • http://files.nworldweiqi.com/uploads/1/3/1/4/131453431/4578662.pdf
    • http://lotezoki.guideswithin.com/uploads/1/3/2/6/132683014/tulegawamabi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0448/3586/4736/files/adobe_2019_crack.pdf
    • https://cdn.shopify.com/s/files/1/0448/3255/5168/files/add_and_subtract_unlike_fractions.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/24634459035.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/76039746295.pdf
    • https://cdn.shopify.com/s/files/1/0431/9766/1348/files/total_war_warhammer_dwarfs_army_guide.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/grossman_cardiac_catheterization_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/4858/2820/files/2695872202.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/lajenufizagoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/wow_classic_light_feather.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000661a.bin
21d16cbea3b1bc4776354364930a17af61a90f969355f1d92f3dd4d6b11af111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661A 5052 bytes
font_01_sfnt_off0000773a.bin
6518ade370faf5e7a453462ca10bf3beda438ce68ffbcd025b3d87741aa49bf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773A 10292 bytes
font_02_sfnt_off00009ac4.bin
7492a2d72eae83eb425dc1179565cd4f880431f95d80035f45e9d1a5042146a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC4 16256 bytes

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