Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c43e73a702bf87b…

MALICIOUS

PDF

55.5 KB Created: 2020-08-31 10:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c8db20de517b43f7ff0e9f02d89ff71 SHA-1: a0f113c319d716def0ac87ac479e41dfebdc92a8 SHA-256: 9c43e73a702bf87bd4328dbf4d295c3af11a37b79d32f3cc03ee70f02ee3691e
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=blondie+rapture+lyrics+meaning'. This URL is likely used to direct users to a malicious site. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing its malicious intent.

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/wix?keyword=blondie+rapture+lyrics+meaning
    • https://cdn.shopify.com/s/files/1/0428/7610/8956/files/58508363056.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9815/files/the_undercover_economist_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6823/files/59194416535.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/nufumifutireni.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/56357104200.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/3052942382.pdf
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/zilutifoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4242/files/chp_traffic_collision_report_555.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2270/files/fizulagekexuwe.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/31523696442.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/94346772807.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5682/files/gosuvigebafuxofadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/27587753907.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_off00008e63.bin
ef95a690a69e68f9182abb66464a7274526d5860f76990c86e32bbcb2cdcd106
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E63 5544 bytes
font_01_sfnt_off0000a130.bin
65f87369aee3d6421a3be4cff25098c36fdb60477bb6222b04bc755a0bbf698e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA130 15232 bytes