Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed779795a50a5bd…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 09:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97b4e7f1dd0b33ffa65e852bf4a8d90e SHA-1: 5f6ae1052621d5cf891e797a791da84bdac34302 SHA-256: 7ed779795a50a5bd5aa3a282bf286e098913a107c4b5967ae78c5c3ef29a246f
150 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure. It also contains a large number of external PDF links, characteristic of a link farm. The primary malicious URL identified is https://ttraff.ru/wix?keyword=insanity+max+30+month+2. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=insanity+max+30+month+2
    • https://static.usrfiles.com/ugd/90c678_302195e15b6048b192f32b416d3b4b10.pdf
    • https://static.usrfiles.com/ugd/ce14f3_f616352db22445b0b8d7fd0f27d8b568.pdf
    • https://static.usrfiles.com/ugd/362633_51cedfb995b648009fc206b6518a2a34.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8618/files/acls_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0454/6068/4952/files/doneguji.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/gebikoje.pdf
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/my_hero_academia_season_2_episode_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/8819/9328/files/momexazazeziruved.pdf
    • https://static.usrfiles.com/ugd/fef806_8968a62e0e3d4e198ab5b45cde128c2d.pdf
    • https://static.usrfiles.com/ugd/ac72e0_feed976c0dc44dcb9cd86d0e9bdb3675.pdf
    • https://static.usrfiles.com/ugd/590778_950a796f94d94dad9822c559db69ca5c.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_aabc16f46ab0489f9b22d4ab54b85bd1.pdf
    • https://static.usrfiles.com/ugd/b8c837_8dca3c9f38e24c15b6f8745bcc7d741a.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_off000061b8.bin
e9fce2930d732439a718b8043fb0abd22865902ecf22d44556e0b93765bb50dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B8 5340 bytes
font_01_sfnt_off000073b6.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B6 1800 bytes
font_02_sfnt_off00007c44.bin
78f6a93e26ebb3c4e8057e57460402cef527e365416d9abd0ef97bd8d1daef0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C44 10312 bytes

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