Malicious PDF — malware analysis report

Static analysis result for SHA-256 df88354aa25a016d…

MALICIOUS

PDF

57.1 KB Created: 2020-08-03 06:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4910845caf80ff23c0657d7bea810dd SHA-1: 989046addf56c78a6ad5d0f898e0f2d7d4d2d787 SHA-256: df88354aa25a016dbc38fd1fdd3686b4ecbd8b2760683a7a165fdadb733b0e9b
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to 'Katolight generators manual' and the malicious URL, suggesting a lure. The presence of numerous embedded links, many pointing to Shopify domains, indicates a link farm strategy, likely to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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=katolight+generators+manual
    • http://files.bartlettyearbook.com/uploads/1/3/1/4/131482946/842436.pdf
    • http://files.btrevents.com/uploads/1/3/1/6/131606491/8275475.pdf
    • http://files.dogcatbird.net/uploads/1/3/1/3/131380627/jiwokajaxajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/gifibis.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/aci_318-_14_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5755/files/ximuvosup.pdf
    • https://cdn.shopify.com/s/files/1/0430/3113/4365/files/86051702719.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lasuzopaxikabade.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/90450503184.pdf
    • https://cdn.shopify.com/s/files/1/0434/0223/1971/files/3d_mohr_s_circle.pdf
    • https://cdn.shopify.com/s/files/1/0432/0300/2523/files/24001689123.pdf
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/navixepokexumu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5727/files/gakemidodenotegerojula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4064/files/snake_game_source_code.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/22401285232.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_off00009633.bin
0c0ddc9694f18b606b434a0900f7c82e6358b44f6c91d6fc8dfaa4700fcdca3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9633 5068 bytes
font_01_sfnt_off0000a748.bin
99a875c1e25c49cd0ac2e0a5f4db79b52b7486231b9683aa2658db5a6d8b0f49
pdf-font-stream PDF embedded font (sfnt) at offset 0xA748 15040 bytes