Malicious PDF — malware analysis report

Static analysis result for SHA-256 239096a68a1eb6d3…

MALICIOUS

PDF

72.7 KB Created: 2020-09-30 02:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c9c04d206c77385a5baa0ef7614da23 SHA-1: 0699f82bc243f39f83884aea98aae64de2e27bce SHA-256: 239096a68a1eb6d31785e15a7d62582ab8cae2d7b1c016b78e641ff3d3ef2d64
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is 'https://gettraff.ru/strik?keyword=hot-+wire+anemometry+principles+and+signal+analysis+pdf', which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links to external PDFs, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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://gettraff.ru/strik?keyword=hot-+wire+anemometry+principles+and+signal+analysis+pdf
    • http://lowerara.benzandbmwrepair.com/uploads/1/3/1/4/131407197/nawoxukufogup.pdf
    • http://files.nejnamc.org/uploads/1/3/1/6/131607346/bujowadatasivo.pdf
    • http://nunip.robheaslip.com/uploads/1/3/0/7/130776445/4629885.pdf
    • http://memujaj.csipto.com/uploads/1/3/0/7/130776436/b8ff2e62da9f1a.pdf
    • https://site-1037085.mozfiles.com/files/1037085/86596885689.pdf
    • https://site-1037003.mozfiles.com/files/1037003/tufewuwip.pdf
    • https://uploads.strikinglycdn.com/files/a84eddff-68dc-4582-8e67-05880b36ddee/58014017751.pdf
    • https://uploads.strikinglycdn.com/files/ab8ac785-7821-40df-8477-e12c38668305/67958469469.pdf
    • https://uploads.strikinglycdn.com/files/59a27bda-77d7-4964-80cf-9a83023a93c7/fetedikabu.pdf
    • https://uploads.strikinglycdn.com/files/5a39c09e-ba02-4d14-9b11-8b866081028f/26583109878.pdf
    • https://uploads.strikinglycdn.com/files/187c9dee-d461-41c3-a8f2-ef52a4f168a6/julezuviwaru.pdf
    • https://uploads.strikinglycdn.com/files/551e56cf-0780-42d9-9b33-0075350866a0/32319126584.pdf
    • https://uploads.strikinglycdn.com/files/5dfd5846-b1f3-4c33-a6e0-1168f948d097/basefawafasusetepemos.pdf
    • https://uploads.strikinglycdn.com/files/6953b736-9d64-414a-97f0-2a925538017f/pirikamevifovanabot.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_off0000c81d.bin
7fed765e34288236a4e3289c22ecaaa41b3b985820c32da5e9c32f5d8b69d319		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC81D 5660 bytes
font_01_sfnt_off0000db65.bin
36a0e7e1f0bc08025804e7034401ea6d00d7220ecb17789cd10389d1bf1a70b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB65 10584 bytes
font_02_sfnt_off0000ffa5.bin
43a91727676af0ba3eb6ce6ebd2db12247922e1d64e4ab207e657d05bbac5746		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA5 16268 bytes

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