Malicious PDF — malware analysis report

Static analysis result for SHA-256 759e1fc9470dc8aa…

MALICIOUS

PDF

51.3 KB Created: 2020-07-30 18:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc74d49aa9cb8852674e2764d89d8dd8 SHA-1: 3f51498b21d7f57748b903148281274d71b7ebb8 SHA-256: 759e1fc9470dc8aa2ce1659c6614ed13c239f6185268f77a516b39fa841a8721
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of outbound links, suggesting a link-farming or spamming operation. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious redirector links and the sheer volume of outbound links strongly suggest a malicious intent to redirect users to harmful 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.ru/pify?keyword=differences+between+apoptosis+and+necrosis+pdf
    • http://files.akcentkafe.com/uploads/1/3/1/4/131453464/gazugesadekuvidakida.pdf
    • http://files.txfreedomforce.org/uploads/1/3/2/7/132740593/mazekitapixiz_vafolukiwilusan_zapupawaragapo_viwakivisi.pdf
    • http://files.m3dengineeringsolutions.com/uploads/1/3/1/6/131636655/vuzomugojeje_gubopozujebidev_tevizapugeti_vugiw.pdf
    • http://files.rinfang.com/uploads/1/3/0/8/130874658/4177508.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/monirizunemekilinodujosum.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1563/files/laropupidevubabafop.pdf
    • https://cdn.shopify.com/s/files/1/0432/6077/2510/files/71617407350.pdf
    • https://cdn.shopify.com/s/files/1/0435/1148/0472/files/ditekukiwitezaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/kuwufaxikegazusokut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79086372433.pdf
    • https://cdn.shopify.com/s/files/1/0429/7333/1609/files/26741603945.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/77817211748.pdf
    • https://cdn.shopify.com/s/files/1/0429/4138/2812/files/7195240888.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/16246759432.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/88682402571.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_off00008c84.bin
7e60a5e75143e9db8926250c8de1704589848cd31f5e459adeda220666ec48a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C84 5136 bytes
font_01_sfnt_off00009e0d.bin
e5b7760a6a8f8f29bb0da0a41c8d3863aa05c65ad05c3e497b158c460f799780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E0D 9916 bytes

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