Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4b7fdac8610ca4…

MALICIOUS

PDF

98.1 KB Created: 2020-09-06 22:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f17caa676979d52213f659d4edd5ee8c SHA-1: b343cf80cfde57aee6a1ad519f7639dbeae2a129 SHA-256: ce4b7fdac8610ca40496cb4c9933f145d3056c5b7b7e0b85a62e491e428c171f
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning and distributing malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=best+laid+plans+lauren+blakely+pdf
    • https://static.usrfiles.com/ugd/9d24cb_3770bd5411a1488f826025051c33006f.pdf
    • https://static.usrfiles.com/ugd/d55797_d525227bf9da47659dcf56f029702b0d.pdf
    • https://static.usrfiles.com/ugd/902d29_5f85a1bc1045427c80bbad07310b77c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3ebaa9e2aa0457ebb96fe2102f33ab0.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bcff15cfa1c4370b1d950ab64693aab.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6533/files/mail_merge.pdf
    • https://cdn.shopify.com/s/files/1/0428/5657/9228/files/57185585527.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5376/files/microsoft_word_blank_checklist_template.pdf
    • https://cdn.shopify.com/s/files/1/0441/4459/1000/files/60346472840.pdf
    • https://cdn.shopify.com/s/files/1/0440/1712/3478/files/adobe_indesign_poster_templates_free.pdf
    • https://static.usrfiles.com/ugd/733c1f_ed41fc6950834e0fbb37ca42eafc17b2.pdf
    • https://static.usrfiles.com/ugd/48f461_7e46c39a568747ceab98379d210325da.pdf
    • https://static.usrfiles.com/ugd/fb83f1_2955126bdacb49829f6545f23f57edb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3dac6d33d23745beac1c2bc26ccdf979.pdf
    • https://static.usrfiles.com/ugd/ca32a8_7fd4c7591fd14719a8c24bec5280a870.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_1b62747c51024fc996cb8195e4217dc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_77bc6dec948540dc8be5515f749ffefa.pdf
    • https://static.usrfiles.com/ugd/b926a8_29df3d0cf4e0481382f52933b391a9ca.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_off000138e3.bin
4036b781439ddd8646b085daf8ffc785f4fc94b7b25c4e37adaea7442a34b842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138E3 5392 bytes
font_01_sfnt_off00014b47.bin
507e256f454404651b1811a3d0d6859a15e752f0c85dc025db408dcd35c170e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B47 2436 bytes
font_02_sfnt_off0001561c.bin
980d7648877d127c189abd0410dca466f76caf368aa3b5cfd0c114fd9a91824b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1561C 10588 bytes

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