Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac426f9ce5cdcd4a…

MALICIOUS

PDF

47.4 KB Created: 2020-08-28 14:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4c9dd97fc87f9bbcc813195027a8e0c SHA-1: 1e3dc075ad96318d3c0cbea10852c6d6f3538d41 SHA-256: ac426f9ce5cdcd4a8ab37344ad7b600a6a235b88133848914b1bb52c9b7928f6
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and a URL that appears to be part of a link farm designed to redirect users to potentially harmful content.

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=lag+ja+gale+ki+phir+hasi+raat+ho+na
    • http://files.snacreates.org/uploads/1/3/1/0/131070207/5302055.pdf
    • http://files.andriesinsurance.com/uploads/1/3/0/9/130969402/3cbbb22dfd4ebb.pdf
    • http://tuduv.wallaceequity.co.uk/uploads/1/3/1/8/131856408/8028035.pdf
    • https://cdn.shopify.com/s/files/1/0430/5177/8202/files/mezimekuwogenodox.pdf
    • https://cdn.shopify.com/s/files/1/0453/8423/7224/files/graphical_analysis_of_motion_worksheet_part_2.pdf
    • https://cdn.shopify.com/s/files/1/0447/7625/9735/files/worksheet_short_o_sound.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/sewesaduremolakojokoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/75650958376.pdf
    • https://cdn.shopify.com/s/files/1/0433/3699/0885/files/womomotuxugimof.pdf
    • https://cdn.shopify.com/s/files/1/0435/2969/9482/files/22045426478.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/zadoxabikiremoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/59228102920.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/acronis_backup_12._5_license_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/0945/6803/files/sadler_queen_gambit_declined.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e8c.bin
381cdc33bbe805dd58f9dbfa45c349c914f0a1a1931e9968f57b0883277505d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8C 5160 bytes
font_01_sfnt_off0000701d.bin
ab59c5c5e08e11190fa65e65db66f73a76e64de74c94fb2162b29b05788f2f49
pdf-font-stream PDF embedded font (sfnt) at offset 0x701D 14136 bytes
font_02_sfnt_off00009cb7.bin
8ad1981d7f93b4e1bc6591880e7f4cdb1d0db0a4f62a6eb27ebbe725153b51d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB7 5104 bytes