Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bac01842029eb82…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 23:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b5b53e92063d4481af3642cb0299604 SHA-1: fc8b34695262f827d7fe0c35d6b1cf2705455b8b SHA-256: 9bac01842029eb82226a45401163ebe47b02412808f4f19495ac064af1fcaf11
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. This URL is presented within the document body, suggesting a lure to trick users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to benign Shopify files, but the primary malicious URL is the most concerning. The ML classifier strongly indicates maliciousness. No scripts were extracted, but the presence of the malicious redirector is sufficient to classify the attack pattern.

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=filtre+graphique+introuvable+open+office
    • https://cdn.shopify.com/s/files/1/0468/0332/0981/files/elasticsearch_the_definitive_guide_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/6467/0873/files/songs_of_the_humpback_whale.pdf
    • https://cdn.shopify.com/s/files/1/0431/1993/5655/files/salagepugezolojutazegewed.pdf
    • https://cdn.shopify.com/s/files/1/0435/3897/2831/files/rijujofixurawemivonena.pdf
    • https://cdn.shopify.com/s/files/1/0433/7988/4186/files/imdb_barney_s_adventure_bus.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/primary_cell_culture.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/arkansas_drivers_license_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/zuxudafaxan.pdf
    • https://static.usrfiles.com/ugd/67e251_cc8bd330cf7b4181b9827cffdf0d7dc9.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2cf83e9374b4bfd93cf9f5b2097fae7.pdf
    • https://static.usrfiles.com/ugd/cf79db_525a70a935604e4e8459ccd28263451b.pdf
    • https://static.usrfiles.com/ugd/3b47cb_f8459ecc22dd46e6b731aa5286507c03.pdf
    • https://cdn.shopify.com/s/files/1/0432/2902/0317/files/terevarobexavavini.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/9204226897.pdf
    • https://cdn.shopify.com/s/files/1/0438/1691/1010/files/java_how_to_program_early_objects.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/27064409585.pdf
    • https://cdn.shopify.com/s/files/1/0434/8503/6706/files/comparative_balance_sheet_analysis.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_off00005c05.bin
bc90d13e14a97e607531ba86c2a1bfc586483bbfb8c73293f66ece8f8e82feaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C05 5380 bytes
font_01_sfnt_off00006e4f.bin
bd28107738d5d890815110e6aa20d302a1d7c374c401e8af0ad10ac35cca96b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4F 10632 bytes

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