Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be221355e87b9d3…

MALICIOUS

PDF

42.9 KB Created: 2020-08-10 15:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6d0ba592603979d6753fa4e9aaa9f7c SHA-1: 5e212c22d82301cee9b26d46eac463ad21b1eb44 SHA-256: 3be221355e87b9d3f111f21d30723ebfe2d56880d27b342d36b0aaead3847dc5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that point to a known malicious redirector, ttraff.ru. This indicates the document is likely a lure to direct users to malicious content or phishing sites. The ML classifier strongly supports the malicious verdict, and the presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted from this sample.

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=argumento+deductivo+pdf
    • http://files.doverashop.com/uploads/1/3/1/4/131437012/1794736.pdf
    • http://files.hisandhersboutique.net/uploads/1/3/1/6/131637055/7157786.pdf
    • http://files.spacecoastal-anon.org/uploads/1/3/1/3/131384468/kozeruforakowar_goderarok_bomuja.pdf
    • http://files.thecrossingwv.com/uploads/1/3/1/0/131070116/4992859.pdf
    • http://files.propowerwashingllc.com/uploads/1/3/0/7/130775786/majuvanifatud.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/91008854136.pdf
    • https://cdn.shopify.com/s/files/1/0440/6899/5224/files/air_pollution_short_essay.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/bejenaxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1433/2309/files/86345533036.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/92749661547.pdf
    • https://cdn.shopify.com/s/files/1/0433/4321/6789/files/28005888521.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/lijawuxesibejexeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/9836/4321/files/game_boy_advance_roms.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/mokupibadofenulaxemufower.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/63529527480.pdf
    • https://cdn.shopify.com/s/files/1/0438/7989/1099/files/46910832344.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_off00006800.bin
1fa043563b8e9fa44b09114cb818e08e5890ea541faac18afbcccea1c948d470
pdf-font-stream PDF embedded font (sfnt) at offset 0x6800 5104 bytes
font_01_sfnt_off00007952.bin
9ea020b7841cff90ceb70b9e381a9c60d53d8f5f200f58b698504abdaad66694
pdf-font-stream PDF embedded font (sfnt) at offset 0x7952 10908 bytes