Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aa9b289197a594…

MALICIOUS

PDF

77.1 KB Created: 2020-08-08 21:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead29b470245fc1f64ab2e049226c262 SHA-1: dae978b3721ed5bc96ae81a1870d1544cf75f0eb SHA-256: 24aa9b289197a594a0cbef674c5a2b3128f47dfd235770d0fe9fb41a8252e352
154 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.com'. This URL is presented to the user with a keyword suggesting a free story PDF download. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains hosting PDF files. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive download 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.com/pify?keyword=english+story+pdf+free+download
    • http://files.desertjade68.com/uploads/1/3/2/6/132682685/5484257.pdf
    • http://files.pacificislandaqua.com/uploads/1/3/1/3/131379054/bb3aca0.pdf
    • http://files.kieraotooleartist.com/uploads/1/3/0/7/130776206/1754780.pdf
    • http://files.teshekpuklake.com/uploads/1/3/1/3/131380279/6589ba3531540a.pdf
    • http://files.hullemanfarms.com/uploads/1/3/2/8/132814097/2120402.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7751/files/alessandro_barbero_costantino_il_vincitore.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0047/files/best_small_free_editor.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/starwars_clone_wars_season_6_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/tugadinod.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/pafev.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/lottery_master_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/82441630283.pdf
    • https://cdn.shopify.com/s/files/1/0448/2806/5949/files/arduino_language_reference_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5576/7967/files/vagunusikufamex.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/36052070087.pdf
    • https://cdn.shopify.com/s/files/1/0430/8362/8697/files/javascript_array_foreach.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_off0000f114.bin
a73142001507e6820af5dd115f3e45bb23eb9cc6dca654827a3e96c2bab842dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 5452 bytes
font_01_sfnt_off000103ba.bin
6032d0ac6a9f8eaaff966590a7ecdcfe43b751deaafb7b372ed8b542bb669d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 10472 bytes

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