Malicious PDF — malware analysis report

Static analysis result for SHA-256 61369e05425a73b5…

MALICIOUS

PDF

43.1 KB Created: 2020-08-29 19:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92ad6e00877f2f25a706fffbeb00a47f SHA-1: 375fcc70b9134d1ce3b918213b8799798fb364f0 SHA-256: 61369e05425a73b5db7159b96223d266eed912fc4eb4ecd8f8e1dbf967f14ce9
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.cc/wix?keyword=ejercicios+de+sumas+y+restas+para+ni%25C3%25B1os+de+primaria'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise its malicious nature as educational content. The presence of numerous other links to PDF files, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO and distribute 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.cc/wix?keyword=ejercicios+de+sumas+y+restas+para+ni%25C3%25B1os+de+primaria
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6844/8165/files/43284251295.pdf
    • https://cdn.shopify.com/s/files/1/0445/3544/7711/files/natural_and_acquired_immunity.pdf
    • https://cdn.shopify.com/s/files/1/0433/9623/5415/files/4396307558.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/49007382432.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9464c5a347c4eaf88625084b4a2eb7a.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_c46713712f6e4fd1a530738ea0e8a0a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6671860f1c5474090ecf45617181fe6.pdf
    • https://cdn.shopify.com/s/files/1/0434/0026/5878/files/kemunduran_dinasti_abbasiyah.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1726/files/reset_to_origin_master.pdf
    • https://cdn.shopify.com/s/files/1/0433/7768/8743/files/85651154505.pdf
    • https://cdn.shopify.com/s/files/1/0428/8882/2950/files/97084773291.pdf
    • https://cdn.shopify.com/s/files/1/0437/2670/0696/files/nizarepororizidofokegemup.pdf
    • https://cdn.shopify.com/s/files/1/0438/4204/4066/files/fedudegulikakiwimuxapawe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0429/6348/files/68417294208.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bdd.bin
fdc3377018c05ea2102bfe4113690cc1df3d8bbac98f763f2762b258fc2d590e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDD 5536 bytes
font_01_sfnt_off00006e54.bin
6e5de5c6bcb7fdd8c5ca0d25823a8f80e6c764803c1b732dbc9c425a5c0f8ea5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E54 2092 bytes
font_02_sfnt_off000077fa.bin
8334ca99cc33129b65476de1d0509566859813f6377eccdc05fd7a277a23a7c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77FA 11272 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.