Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd872a8feeee95f…

MALICIOUS

PDF

63.5 KB Created: 2020-08-17 15:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db706ad11d7308567b995e614937e73b SHA-1: f7f3f21120973cb474f8a0e3733a4de15e425d15 SHA-256: fdd872a8feeee95f870be7cb333aaf27ce3d88f24e9d63af095251836fd3860f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, indicating a large number of outbound links, with the primary one leading to the same redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure.

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=wordpress+template+full+screen+background
    • http://files.mygrmobilervrepair.com/uploads/1/3/1/3/131382239/rokamokivexub_pusigebuba.pdf
    • http://files.helmetandgoggles.com/uploads/1/3/2/8/132816036/db917a.pdf
    • http://suzareted.msohomes.com/uploads/1/3/1/8/131856040/fukiza.pdf
    • http://files.luxurytophomes.com/uploads/1/3/0/9/130969545/xexew_subugumuvav_segetexiwomos.pdf
    • https://cdn.shopify.com/s/files/1/0431/2354/0124/files/35113166096.pdf
    • https://cdn.shopify.com/s/files/1/0432/2800/4507/files/pubopedanika.pdf
    • https://cdn.shopify.com/s/files/1/0432/3750/7240/files/lamadumag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedifoniwupub.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/rupawamuxusedefo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0835/files/53923555274.pdf
    • https://cdn.shopify.com/s/files/1/0440/5533/0981/files/adding_fractions_with_like_denominators_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0435/3071/5288/files/vuvefuzugivor.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/bikum.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/wurilig.pdf
    • https://cdn.shopify.com/s/files/1/0433/9010/7815/files/images_to_gif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5951/0424/files/gamesir_world_for_ios.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/vujogotofabadadivigi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/pivedebo.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_off0000bad4.bin
d1306047798f32b53f76b6185ffaafd020cfdeaa46c9b96b911fbf776afc5ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD4 5692 bytes
font_01_sfnt_off0000ce2a.bin
aaefcddfd4bf37e3bde810145a544f87ac9b01d67ae15693da6ab888b96634fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 9896 bytes

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