Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0cab568ef1d4c7f…

MALICIOUS

PDF

46.0 KB Created: 2020-09-08 04:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a48596add60a7adb6e4964f4cd5f5d5 SHA-1: b3051a30e4093d65bef9ee30a03a80e8cd7ee5c7 SHA-256: a0cab568ef1d4c7fa6aa1c447548fb58f0eadec775796923c559a70b56686cb3
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 'https://ttraff.link/wix?keyword=game+kawaii+home+design'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, suggesting a lure to download further malicious 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.link/wix?keyword=game+kawaii+home+design
    • https://static.usrfiles.com/ugd/ceb2e8_ea251ff03b284484a9149795cc83039f.pdf
    • https://static.usrfiles.com/ugd/d99ef3_23a93f6d9bbd41a1b6c6cfc257c9fe75.pdf
    • https://static.usrfiles.com/ugd/50de67_0dfb4047709c4ef39d794797137be758.pdf
    • https://static.usrfiles.com/ugd/c88839_ff0033b1ca404c31a418bbf273a1dcdf.pdf
    • https://static.usrfiles.com/ugd/a07927_ef2044c298f24e7c854afd25eed2b28f.pdf
    • https://static.usrfiles.com/ugd/86319b_2b5cc6fa984d4586a05c4e2fce92ac26.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/zujebetekuzi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/cancer_immunology_and_immunotherapy.pdf
    • https://cdn.shopify.com/s/files/1/0440/3740/6870/files/anusandhan_bengali_film_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/1760/1181/files/hella_hoes_asap_mob_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/77550157076.pdf
    • https://cdn.shopify.com/s/files/1/0432/0336/2973/files/zizegijalosopuxo.pdf
    • https://cdn.shopify.com/s/files/1/0439/1016/8744/files/kobuvemabiduxiguxo.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_off00005eff.bin
e5a1756408574639d0ec71527413eda0f604beb3f1ef19b518bb761bae1f9a98
pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFF 5300 bytes
font_01_sfnt_off000070fa.bin
7b3f1b2706501469706804582ef21aa1a8d842a18f5017894c54f92ae2240b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x70FA 10808 bytes
font_02_sfnt_off0000960d.bin
0840ff420cc1f21cf86f5e46eefb89f9aca2ef174ad490b35aaa889abd60867d
pdf-font-stream PDF embedded font (sfnt) at offset 0x960D 16120 bytes