Malicious PDF — malware analysis report

Static analysis result for SHA-256 8928af89378e5a48…

MALICIOUS

PDF

45.4 KB Created: 2020-08-16 00:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13655e80082f0ea711c37696ebfdc7bd SHA-1: cc1bb8c1c3bb206b8a6d0cebbf7e5c2731cda796 SHA-256: 8928af89378e5a4875fdf1c5346ece10430df92ead44dae42017f423e9c6daf9
152 Risk Score

Malware Insights

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

The PDF file contains embedded links, one of which points to a known malicious redirector (ttraff.com). The ML classifier also flagged this PDF with high confidence. The presence of numerous links, including to external PDF files, suggests a link farm or redirection strategy. The document body contains garbled text and some URLs, further supporting the redirection attack pattern.

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.com/wb?keyword=nikolai%20yezhov%20pdf
    • http://favom.intucoaching.com/uploads/1/3/0/7/130738970/vuxemixevowexa_kuzedisezofi_pamulapaxupofip_vozegure.pdf
    • http://bidet.vasiliagraboski.com/uploads/1/3/1/3/131379730/80ff5a4270.pdf
    • https://cdn.shopify.com/s/files/1/0447/6980/4439/files/articles_of_association_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/ratiguzaridiwiwekev.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/army_class_b_uniform_setup_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/alcatel-_lucent_omnipcx_office_communication_server.pdf
    • https://cdn.shopify.com/s/files/1/0437/7955/5486/files/sareresov.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1687/files/91178059797.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/refesudizo.pdf
    • https://cdn.shopify.com/s/files/1/0448/5450/9729/files/english_words_meaning_list.pdf
    • https://cdn.shopify.com/s/files/1/0431/6918/5943/files/24502543530.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_off000074d0.bin
3c1ceaf34103f7ff6932932ad3a10436f99af3c5f3d92d4d58a927f084b7f10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D0 5100 bytes
font_01_sfnt_off0000863a.bin
0a967b7d2fdcd4c13d23be3473131f81f4d0dcf98d3ad6534903b5fb4b85cb9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863A 10240 bytes

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