Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f58db054ae60f0…

MALICIOUS

PDF

63.5 KB Created: 2020-09-01 00:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19fe6c6be70f0ae4b5f872ac1858cbf1 SHA-1: da5bf07dcd99b31476e2da3efbaf726e05777105 SHA-256: 23f58db054ae60f09c7d35bed9f82a2009d3d9b0695d4c0666ef5a941a962ce4
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL that leads to this redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves tricking users into clicking malicious links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=fancybox+lightbox+jquery+free
    • https://static.usrfiles.com/ugd/b8c837_1845900f8f6c4f749ea740a21fd36569.pdf
    • https://static.usrfiles.com/ugd/10e3af_0cd835201aec453089fdc80252716721.pdf
    • https://static.usrfiles.com/ugd/0bcf16_2c0c3dde556648658a131e8bde8163f8.pdf
    • https://static.usrfiles.com/ugd/3649d2_00390e6bbbb14f21b15dfc809f23c49f.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2962/files/manaboladinunorek.pdf
    • https://static.usrfiles.com/ugd/cc14e4_80dbd62b21a34d8d8d8253934d6c7d62.pdf
    • https://static.usrfiles.com/ugd/ca300b_bacf7726faf441e6ba657f503262f6e8.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7572/files/44878326122.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/how_to_quote_discord.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/tatiribizavitesumabike.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000910c.bin
4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
pdf-font-stream PDF embedded font (sfnt) at offset 0x910C 6588 bytes
font_01_sfnt_off0000a185.bin
3888eb99f6c162f1b2fdb2565cb38bbd52ca6977ba0d6c9a37bd23c446781cce
pdf-font-stream PDF embedded font (sfnt) at offset 0xA185 5432 bytes
font_02_sfnt_off0000b408.bin
f83e6de3691ad52a85b4b046ce3648991255f336d0397087d3cee8e58848d230
pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 1724 bytes
font_03_sfnt_off0000bca5.bin
3f6169b5f5a723695f3f94dda7297176b753d1bde6ac323592a56b944916deec
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA5 16488 bytes