Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c48bb758f5f7a7…

MALICIOUS

PDF

81.6 KB Created: 2020-09-06 19:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 388923b852103066fa2c68dcb6d0ce05 SHA-1: 45391f2c2ab1b4f8bbfb6cec5ca9d0e334a99268 SHA-256: 81c48bb758f5f7a7f2affdad953b6b97cb9cc8280c2351f244c96191a203565f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a lure related to 'afshar rugs' but is heavily obfuscated and contains a large number of links to external PDF files, many of which are hosted on Shopify. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=guide+to+afshar+rugs', is flagged as a malicious redirector. The ML classifier also strongly indicates maliciousness. The primary attack pattern observed is the use of a deceptive document to redirect users to malicious infrastructure.

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=guide+to+afshar+rugs
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/21517150408.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1402/files/kofubu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gibowutobarifokegibig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13164506765.pdf
    • https://static.usrfiles.com/ugd/b7306e_cdc5c14589054ab494d73a0eb75b501a.pdf
    • https://static.usrfiles.com/ugd/d4df0f_1eb039435ebe4e8d988c04bc65060622.pdf
    • https://static.usrfiles.com/ugd/0af078_1106f82899dc43a9ae1045d7659a38cb.pdf
    • https://static.usrfiles.com/ugd/9ff9b8_431c18df74584f30b483f413f5d18c6b.pdf
    • https://cdn.shopify.com/s/files/1/0433/3718/7493/files/70767530205.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/astm_a536_84.pdf
    • https://cdn.shopify.com/s/files/1/0470/9430/0830/files/mcent_browser_hack_apk_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/1184/9890/files/44411805545.pdf
    • https://cdn.shopify.com/s/files/1/0431/8520/9512/files/map_of_usa_cities.pdf
    • https://cdn.shopify.com/s/files/1/0471/0360/6934/files/45522739793.pdf
    • https://cdn.shopify.com/s/files/1/0430/3775/3501/files/vizuzemavupanulijagebe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/17011648908.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001050f.bin
b08770e372b3e2ffd33c4982627d591f4e39f6a1f82b2961e843ae363fb28743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 5168 bytes
font_01_sfnt_off000116a2.bin
fd0495162cf74ea5fee6c2a18e3fbaa102c061689be7faab00e44ad6b1b79a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A2 10184 bytes

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