Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d18a6ccf5ec17c9…

MALICIOUS

PDF

65.6 KB Created: 2020-08-24 19:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f838acce06906cd16c63eb73da9e882e SHA-1: 136f08c39713dea2457a0514627c918621bbf161 SHA-256: 2d18a6ccf5ec17c98406b3b5f7e2855a3d364ea929136b142946aeb3c6045ec8
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, disguised with keywords related to 'Assassin's Creed Syndicate', points to a suspicious domain. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify, suggesting an attempt to obscure the malicious destination. The ML classifier 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=assassin%2527+s+creed+syndicate+xbox+one++code
    • http://files.balletbeats.co.uk/uploads/1/3/1/8/131856212/sufafomoxem.pdf
    • http://nufizoz.herodebeauvais.com/uploads/1/3/1/4/131407406/nivaniveta.pdf
    • http://files.gildatgarbanzos.org/uploads/1/3/0/9/130968943/2383923.pdf
    • http://files.fitnessbyloren.com/uploads/1/3/1/0/131070362/4877556.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/libivose.pdf
    • https://cdn.shopify.com/s/files/1/0431/7052/9436/files/76475800316.pdf
    • https://cdn.shopify.com/s/files/1/0433/4803/3689/files/75966055868.pdf
    • https://cdn.shopify.com/s/files/1/0451/6433/1162/files/cracker_barrel_employee_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0429/1208/8231/files/number_format_javascript_function.pdf
    • https://cdn.shopify.com/s/files/1/0431/7075/8820/files/descriptive_adjectives_word_search.pdf
    • https://cdn.shopify.com/s/files/1/0435/6407/3128/files/60650139061.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/52446572137.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_off0000c445.bin
541d3236355505adc3d5892b69a3c95bd25d914eca107d4f9dd59aa412b5537a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC445 5232 bytes
font_01_sfnt_off0000d621.bin
3bcdc72c2cba4e469d5d3d8096852a731902836acc865cbd17077207b6556788
pdf-font-stream PDF embedded font (sfnt) at offset 0xD621 10420 bytes