Malicious PDF — malware analysis report

Static analysis result for SHA-256 41976ae1f501a015…

MALICIOUS

PDF

52.6 KB Created: 2020-09-05 03:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26e805c12f259358f5e6774058976d3a SHA-1: 7056544e04d3daf6a962a360471792ed0b1aef28 SHA-256: 41976ae1f501a015e4d8ad65582fa9062c5e306de76e1355eed63ecc735b9b14
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.club, which is likely used to deliver a payload or phish for credentials. The document body, though heavily obfuscated, contains the same keyword as the URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links further supports a malicious intent, likely related to SEO spam or drive-by downloads.

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.club/wix?keyword=ultrasound+guided+kidney+biopsy+cpt+code
    • https://static.usrfiles.com/ugd/2c7c49_6a43d2fece1046ad9c38db1d1509435f.pdf
    • https://static.usrfiles.com/ugd/0bfb20_2306157ad9564b90ad30f6afb988b1c7.pdf
    • https://static.usrfiles.com/ugd/7e6083_502f31916c4f4b34852b5b98ea9d5367.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_0c473f6fb19b45839080c3de241c505c.pdf
    • https://static.usrfiles.com/ugd/8716ab_73ebc833fadb49aaa8039c3867150a1e.pdf
    • https://static.usrfiles.com/ugd/738632_27c3850909c14587a052ced5ae5006b4.pdf
    • https://static.usrfiles.com/ugd/b98abb_7481fff6e02f46a4a162cdcf5ce3705b.pdf
    • https://static.usrfiles.com/ugd/0e6328_7b1e21f1b820403585c927b2a4dcd790.pdf
    • https://static.usrfiles.com/ugd/7f614e_6305d5a6884446d9b8477753271de8fd.pdf
    • https://static.usrfiles.com/ugd/c6ac46_26dcdbee6890497cb4d01dbce0732c68.pdf
    • https://static.usrfiles.com/ugd/08fe48_98618dc52243495daf53ddee5e805b96.pdf
    • https://static.usrfiles.com/ugd/cafc24_c07bf09bfb4647ce99dd6aced875446d.pdf
    • https://static.usrfiles.com/ugd/f6a907_118f75b6e2ad4af8880279db5f9dbea3.pdf
    • https://cdn.shopify.com/s/files/1/0431/2304/8609/files/28644449163.pdf
    • https://cdn.shopify.com/s/files/1/0449/7919/1966/files/jowapiwek.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_off000082b8.bin
00bb8aa6d79fa1bf4d95d6eef759da0504f25c3fae56ca933cb745c6b3407d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B8 5420 bytes
font_01_sfnt_off0000952d.bin
b051432ce595ee04c823c2a3bca35505070fe54fe89f1bdad1fa87e8c6844e85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x952D 9980 bytes
font_02_sfnt_off0000b73e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB73E 4324 bytes

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