Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e737f8d7a9e471…

MALICIOUS

PDF

124.4 KB Created: 2020-08-30 12:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dae2cafe3ec6f5695d3ac5cc9cf935a5 SHA-1: e92bf98d5abff80a89d888ff7de8ba3dcb2d9189 SHA-256: b5e737f8d7a9e4712a68b3964d036bdee4795d2afaff9033fd43966350702b80
152 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=alexander+osterwalder+pdf'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The ML classifier also strongly indicated maliciousness. The file is likely a downloader or part of a phishing campaign.

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=alexander+osterwalder+pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4982/files/23015702125.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6966/files/gedewiruzegorugoviriz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/wusizitew.pdf
    • https://cdn.shopify.com/s/files/1/0433/6392/6174/files/97282403964.pdf
    • https://cdn.shopify.com/s/files/1/0437/8601/0776/files/boss_katana_50_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/nomitunixexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3962/9218/files/85458925179.pdf
    • https://cdn.shopify.com/s/files/1/0432/3088/8094/files/23265825638.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/75700153290.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/10497397615.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/49984310408.pdf
    • https://cdn.shopify.com/s/files/1/0434/0898/2165/files/30347641588.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/dialectical_behavior_therapy_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/8817/5513/files/beserugixapam.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/hotspot_shield_latest_version.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_off00019de3.bin
4560c16189ef0367e0ac72a897579ee5a6d612651f7d546f380a98c27f0e1bf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x19DE3 5184 bytes
font_01_sfnt_off0001afaa.bin
7da4fbe967ec047f1d9a186ba947c8722d05ba2bd9d0b6cfb45fec7301c93b35
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFAA 16896 bytes