PDF malware analysis — malicious · 0bf3b8d5ee37c18f

MALICIOUS

PDF

36.6 KB Created: 2020-09-14 17:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 015cb62e9d59392c5aacb491af400718 SHA-1: c440a0d403956c33468ec62a8bcafdfc7e93e878 SHA-256: 0bf3b8d5ee37c18fd57991fdf04e516ba1e9fda55e8758226ff7abc71d843ecf

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.ru/pify?keyword=icon+pop+quiz+answers+characters+level+3'. The document body, though heavily obfuscated, contains text suggesting it is related to a quiz, likely a lure to encourage clicks. The presence of many external links, some pointing to benign PDFs, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector.

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=icon+pop+quiz+answers+characters+level+3
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/cafc24_23023d9c9f464aa492477f2c12b0dde3.pdf
- https://static.usrfiles.com/ugd/9df9d6_35fbe9b103b54ff59a6d78731d24c386.pdf
- https://static.usrfiles.com/ugd/badafb_a104d4629b2148c1a6f112d735ff9cdd.pdf
- https://static.usrfiles.com/ugd/b4a829_d5d552d01aa845feb86a8754870a822f.pdf
- https://static.usrfiles.com/ugd/b80405_e74e6ec325c14122bf8cafc855e11ffc.pdf
- https://static.usrfiles.com/ugd/12daa7_edcf0e175cef4d72b61997f7bd2e4872.pdf
- https://static.usrfiles.com/ugd/b910ae_3aca4e3c440d4d34961fe2567d80f877.pdf
- https://static.usrfiles.com/ugd/bc0d1e_022f3c6f36524d3c9bc77d8946dd8029.pdf
- https://static.usrfiles.com/ugd/762c1a_bfeaa8893dc34d50b162dbbcf5cf7cdd.pdf
- https://static.usrfiles.com/ugd/b50c55_40187d7cfe7145d4ac12b3a328e70ed3.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.

Filename	Kind	Source	Size
`font_00_sfnt_off000051e9.bin` `ea9fd5d6a2e02f4b4272ba3ba90ddbc723afbf242807511f688590251f2ec0f5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x51E9	5452 bytes
`font_01_sfnt_off00006493.bin` `9c20d907ec689281eb52fda3b704222ad218211c43813396267fc82436147283`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6493	9860 bytes

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