Malicious PDF — malware analysis report

Static analysis result for SHA-256 9420750649fb0212…

MALICIOUS

PDF

35.2 KB Created: 2020-08-20 11:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b4f4dee809c8fd838f9f6091bb0d382 SHA-1: fc726a42e25bdc530253585d4dae9d5f0907aac1 SHA-256: 9420750649fb021225f22dac1405c00ea12533c29f8092d132c7d16408e08d3c
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.cc. This suggests a link farm or redirection tactic to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, indicating an attempt to lure the user to a potentially harmful site.

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.cc/pify?keyword=holy+holy+holy+audrey+assad+sheet+music
    • http://files.erikaschool.com/uploads/1/3/1/4/131406430/babezakivid.pdf
    • http://madav.pfoa.com/uploads/1/3/2/6/132680813/kixejuvif_sevoke_sakape.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7621/files/class_behaviour_chart_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1658/files/audi_a3_sportback_2008_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5241/6672/files/29523774986.pdf
    • https://cdn.shopify.com/s/files/1/0438/0504/8994/files/delijepotigavenedifu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/78286308754.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/kotovisupolixu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0079/1191/files/balloon_tower_defense_5_android_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/5070/2750/files/cahiers_pour_l_analyse.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/decimals_worksheets_for_class_5.pdf
    • https://cdn.shopify.com/s/files/1/0435/2838/8772/files/introduction_to_forensic_anthropology_byers_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0897/4235/files/tent_groundsheet_argos.pdf
    • https://cdn.shopify.com/s/files/1/0440/3753/7942/files/327674116.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_off00004512.bin
6e6f785eff2fdd052ce4bbd21a1d848550c4406e26001e60f36dfc44a3b6bd55
pdf-font-stream PDF embedded font (sfnt) at offset 0x4512 5240 bytes
font_01_sfnt_off000056bd.bin
9fc2641d0fee172914c992efaa0768ee8aa14f5404a6abd37077fb7f990dcc92
pdf-font-stream PDF embedded font (sfnt) at offset 0x56BD 13356 bytes