Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5b99b0d1ab67fb…

MALICIOUS

PDF

56.0 KB Created: 2020-08-18 17:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b1fd43e73526d49e8970bb3a00dc223 SHA-1: d9ca17398dc95353dc10aa689e0df6765e0de9d7 SHA-256: 5a5b99b0d1ab67fb7c4aa323eb4bf991eaa7e30cbd59e50669f08d570f817438
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.cc, which is a strong indicator of malicious intent. The document body, though heavily obfuscated, contains text that appears to be a lure related to a '5e fighter character sheet'. The presence of numerous external PDF links, many pointing to Shopify, suggests an attempt to obscure the true malicious destination and potentially engage in SEO manipulation for distribution. 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.cc/pify?keyword=5e+fighter+character+sheet
    • http://files.princetonfamilywellness.com/uploads/1/3/2/7/132740362/zixokifafiwivojij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4323/2661/files/xusebonawigosefu.pdf
    • https://cdn.shopify.com/s/files/1/0436/3829/2638/files/zirisagipi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/9695068876.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/godzilla_game_pc.pdf
    • https://cdn.shopify.com/s/files/1/0440/6060/6616/files/clp_outages_map.pdf
    • https://cdn.shopify.com/s/files/1/0429/3492/7513/files/teddy_bear_picnic_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8838/files/agar._io_hack_apk.pdf
    • https://cdn.shopify.com/s/files/1/0437/5068/6874/files/birthday_paradox_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0434/9899/5864/files/dps_warrior_bis.pdf
    • https://cdn.shopify.com/s/files/1/0436/2344/8736/files/96067816862.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009e8f.bin
26562407b4fd3a345d6c5bb6faf4cd736cde217f0734c07b358688ca8fd24f11
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8F 5140 bytes
font_01_sfnt_off0000b006.bin
92193387a2ceaab58303267904c34da188f95395833bed866b3e0a25673f21e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xB006 10372 bytes