Malicious PDF — malware analysis report

Static analysis result for SHA-256 f057032f0e8f31be…

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 13:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbe19f76eac7dc2707ccb914c8b38a30 SHA-1: 4e1ede8201367ef78088a0c94ff107bfc3cca821 SHA-256: f057032f0e8f31bee2752e5412e517a7c8710d868a24cfc5e5f8324c7c08b8cb
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains the same URL. The presence of numerous external PDF links, many hosted on static.usrfiles.com, suggests a link farm or SEO poisoning technique to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=racconti+brevi+in+italiano+pdf
    • https://static.usrfiles.com/ugd/bf0735_41207c3350c0404db8f2300bb8bb925e.pdf
    • https://static.usrfiles.com/ugd/defdb4_0514545bb18c4d269d3722ecc936fa38.pdf
    • https://static.usrfiles.com/ugd/18f527_f56343b05c18439cbd7df27e89fd7580.pdf
    • https://static.usrfiles.com/ugd/b47706_e183fd34f215473f8bb579e7c879dbc0.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/kiralegubeveturuganu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8988/7396/files/color_vision_test_book_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a206b7a0ab04a67a81015ebafe58d00.pdf
    • https://static.usrfiles.com/ugd/3b47cb_4f3d0c4272d44864831d9a76c6093cb6.pdf
    • https://static.usrfiles.com/ugd/7d21c0_91de685b892c4533b2d1c5acef22e29d.pdf
    • https://static.usrfiles.com/ugd/e2c250_289500d0b0c64eb68f6a36926793115b.pdf
    • https://static.usrfiles.com/ugd/8127dd_2129bc219261430b88ef2bb75d014221.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000662e.bin
827ec50e18b01c9ef0d27a2c418f5ea2c9bc7de28169662af96441293462a531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662E 5176 bytes
font_01_sfnt_off000077e6.bin
10e4db5222e795b82ba50b3651af959df63dcb0cc6244d02d729e2a332ac6e6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77E6 11196 bytes

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