Malicious PDF — malware analysis report

Static analysis result for SHA-256 931a8ba7d6969cbb…

MALICIOUS

PDF

39.1 KB Created: 2020-08-23 21:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfae21b96d0c2a443d79324cfa3b5f61 SHA-1: 74973aeacb60f6a95fdb8c9a7ebf792d526a7940 SHA-256: 931a8ba7d6969cbb83179ee520daefb02db3308e368609a060fdd83438acd83c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to `https://ttraff.ru/pify?keyword=city+states+in+mesopotamia+worksheet`. This redirector is known to lead to malicious infrastructure. The document body, though heavily obfuscated, contains the same suspicious URL, indicating the primary purpose is to lure users into clicking malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=city+states+in+mesopotamia+worksheet
    • http://mitobat.junglelakelabradorlodge.com/uploads/1/3/0/8/130814328/jisexefe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1739/5611/files/31595878002.pdf
    • https://cdn.shopify.com/s/files/1/0436/4995/8046/files/79800994847.pdf
    • https://cdn.shopify.com/s/files/1/0430/5174/5442/files/zinejitovanuta.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/tugunoxitosalugalik.pdf
    • https://cdn.shopify.com/s/files/1/0434/9581/7382/files/movies_counter_2018_bollywood.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1738/files/gurumo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/forever_21_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0465/2659/5222/files/kibiwetagumakorufex.pdf
    • https://cdn.shopify.com/s/files/1/0436/3590/0569/files/bejeweled_board_game_rules.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_off00005a93.bin
ed2b601afea533d56afb99a4d4f0450ef14e465ab4b3a3be7d096ad053f35a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A93 5192 bytes
font_01_sfnt_off00006c23.bin
6b0812fd1d4c7ea71b524b0c21c0cb8d535d98b7662618e51019f125b64acec1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C23 10272 bytes

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