Malicious PDF — malware analysis report

Static analysis result for SHA-256 361ae6d7e523b281…

MALICIOUS

PDF

41.4 KB Created: 2020-08-25 13:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4ce90be50f6b8878d93e2d75543d9b3 SHA-1: 4ffdcd0a4943f76e84ba01a6758295afcfe7265f SHA-256: 361ae6d7e523b281ad2436651fb06ef0dbdee194a102b4893a49b3c62b4ae992
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm hosted on ttraff.ru. This infrastructure is known for redirecting users to malicious content. The document body, though heavily obfuscated, contains the primary redirect URL and references to other documents hosted on Shopify. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links, suggesting a phishing or redirection attempt.

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=akunda%2527+s+bite+farming+guide
    • http://files.amanagerminute.com/uploads/1/3/0/7/130776031/ledasupesu_fevaniben_xusipu_xusud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niwaxesajikibulunetegidu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/format_for_business_letter_uk.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/98697345060.pdf
    • https://cdn.shopify.com/s/files/1/0433/8309/5459/files/44269495035.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/benevolent_assimilation.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/kofomenasarif.pdf
    • https://cdn.shopify.com/s/files/1/0432/8515/1897/files/starbucks_branding_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/airline_management_system_project_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0431/8360/3876/files/71931100019.pdf
    • https://cdn.shopify.com/s/files/1/0435/9657/8975/files/simple_past_exercises_esl.pdf
    • https://cdn.shopify.com/s/files/1/0431/6515/5489/files/bafosozugefotexagada.pdf
    • https://cdn.shopify.com/s/files/1/0431/1449/6161/files/aphasia_treatment.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_off0000631e.bin
b4fbf1a5bfd319a400090aa2ff6c12dc2ed7b813c10a1b1110c9c935ae642656
pdf-font-stream PDF embedded font (sfnt) at offset 0x631E 5424 bytes
font_01_sfnt_off0000757b.bin
399284c025fc0c4a4cccfe9b9e30c4aa2d75d8c074695797012a18a64e158789
pdf-font-stream PDF embedded font (sfnt) at offset 0x757B 10456 bytes