Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd9aae6258a3e5f…

MALICIOUS

PDF

33.1 KB Created: 2020-09-01 07:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a07be67f535dd30df912f010936587e SHA-1: c74f856b839d2535e3aa353057b969deaeafa635 SHA-256: 6dd9aae6258a3e5fe9c7afb878e589512c39c9b6b46689fb4db3ca3dbdb89550
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs suggests an attempt to lure the user to malicious sites, likely for further exploitation or credential harvesting.

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=fairest+of+the+fair+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/c63dba_5242aa1875b542c7964c32241833cb5a.pdf
    • https://static.usrfiles.com/ugd/d54300_d0a65a5e07114f9b85248dfde64e1f89.pdf
    • https://static.usrfiles.com/ugd/a91264_048ae1078da84c4197dfa0fbb747b073.pdf
    • https://static.usrfiles.com/ugd/4d400c_ee3b1d146ae54bd2bfa4fe0d6e616693.pdf
    • https://static.usrfiles.com/ugd/003b86_6d0a4e4e6eb54f87a62dd373def3063c.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_adeb161f14054ec0914a6a2c1c24ec46.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf05ce16c7674097a1f1da5467c5178b.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/99481936168.pdf
    • https://cdn.shopify.com/s/files/1/0428/1263/7351/files/banking_regulation_act_updated.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56666804065.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_off00004576.bin
3cff3fd233b6a0a0fb314439634037ef5631772fb4740083a2e2a4fa3965872f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4576 5044 bytes
font_01_sfnt_off0000566f.bin
3ff70d0de76b5bac943cb728fbc34190cd850e7c2e42a2acba07d175c17453ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x566F 9916 bytes

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