Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b31b369cfdc530…

MALICIOUS

PDF

48.6 KB Created: 2020-09-01 13:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c669eca4f9d587bc16c47422a890f40 SHA-1: 6378db4f6dc10a06d73bb7f42c7c0d21e03c38c3 SHA-256: 52b31b369cfdc5305bb17a13f2257f271b7f4118bb20b36e3963ac1398c5adc6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a malicious redirector link disguised as a download for 'cheat engine 6.8 free'. This link points to 'https://ttraff.link/wix?keyword=cheat+engine+6.+8+free', which is flagged as malicious. The document also exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on cdn.shopify.com. The ML classifier strongly indicated maliciousness.

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=cheat+engine+6.+8+free
    • https://cdn.shopify.com/s/files/1/0434/5449/6921/files/formule_cerfa_2042.pdf
    • https://cdn.shopify.com/s/files/1/0447/4011/6629/files/oxford_bookworms_library_stage_3_martin_luther_king.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2743/files/12388040536.pdf
    • https://cdn.shopify.com/s/files/1/0435/7763/9071/files/destination_a2_grammar_and_vocabulary_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1573/files/3385394959.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/49932880279.pdf
    • https://cdn.shopify.com/s/files/1/0429/9456/5271/files/kawowuborafitalebodaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/gradable_adjectives_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/82794217132.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/jivukixaperosavubenilere.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1072/files/87582787825.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/pigufojubipov.pdf
    • https://cdn.shopify.com/s/files/1/0433/7664/0156/files/pillow_forms_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/vexodadixibiso.pdf
    • https://cdn.shopify.com/s/files/1/0463/4741/9809/files/dilezibesimusarar.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_off000068cf.bin
7e130cf01a66afc2bc4e2d588ea4a896cf05e810abb9f03b3cc422c989c20be5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CF 4852 bytes
font_01_sfnt_off000079d1.bin
f2854053f22c1b8601916640f3ea19c72f357c52777a042c5430580076efcdec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 5104 bytes
font_02_sfnt_off00008b32.bin
dbeb8a4f25d574ae7207945a7592e83775974627749c5782cecf8851cb6b1106		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B32 13428 bytes

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