Malicious PDF — malware analysis report

Static analysis result for SHA-256 b643e1a40d54e570…

MALICIOUS

PDF

52.6 KB Created: 2020-08-09 06:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ac1af31700a53ba7f9d6eaae423c347 SHA-1: 378a60f234118d0d85a8c2782f05e3ac7a69319d SHA-256: b643e1a40d54e57058fe8654d8f6bc9a480fad8a989942d69b7cf81abce46be9
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the malicious URL and references 'retail marketing pdf files', suggesting a lure. The ML classifier strongly indicates maliciousness.

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=retail+marketing+pdf+files
    • http://files.threeriversautomodelers.net/uploads/1/3/1/4/131411199/7939a7b4.pdf
    • http://files.wallaceriverhaflingers.com/uploads/1/3/0/7/130739169/judaka_wifawatis_bavedokiriduko_gelikupajet.pdf
    • http://files.officeassetsreused.com/uploads/1/3/0/7/130740053/zoxelirasarotikebit.pdf
    • https://cdn.shopify.com/s/files/1/0437/7310/0184/files/discord_rules_server.pdf
    • https://cdn.shopify.com/s/files/1/0428/3029/9292/files/voxavuturoleb.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/automower_installation.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9133/files/63770143161.pdf
    • https://cdn.shopify.com/s/files/1/0435/3874/3450/files/94641546581.pdf
    • https://cdn.shopify.com/s/files/1/0433/8686/3783/files/a_story_of_yonosuke.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0488/files/r_rajkumar_sogs.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/warlock_unearthed_arcana.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tivaluzisezulumavolo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/mechanical_properties_of_alloy_steel.pdf
    • https://cdn.shopify.com/s/files/1/0452/7433/3346/files/direct_expenses_examples_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fufabolip.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4157/files/pobefire.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_off00008fc7.bin
5bacd202d20cad47c02c979736dcde8ba771f71af4a0bac1782e802aad805dd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC7 5432 bytes
font_01_sfnt_off0000a237.bin
8c5f9d0923302de74c6262c68cd632cd231a3fca326e686ac2a38fe33c438796
pdf-font-stream PDF embedded font (sfnt) at offset 0xA237 10272 bytes