Malicious PDF — malware analysis report

Static analysis result for SHA-256 a81aecc98d35653f…

MALICIOUS

PDF

40.7 KB Created: 2020-10-11 03:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 86a4a29f7677e307fa74ac63ac81f5b6 SHA-1: eaf4cce4a876d7370a2e63bd89e3e43cc0d2cf50 SHA-256: a81aecc98d35653fe92eccd15938b7941afe7df51a1e69f66901bcc37e554687
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The document body, though heavily obfuscated, contains the URL https://cctraff.ru/strik?keyword=mariage+d%252527amour+piano+sheet, which is likely the intended destination for users clicking on the document's links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=mariage+d%252527amour+piano+sheet In PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/84567477956.pdfIn PDF document text
    • https://site-1036898.mozfiles.com/files/1036898/27412555087.pdfIn PDF document text
    • https://site-1036730.mozfiles.com/files/1036730/12419592181.pdfIn PDF document text
    • https://site-1038493.mozfiles.com/files/1038493/mazabugedapubilazat.pdfIn PDF document text
    • https://site-1039431.mozfiles.com/files/1039431/27057818864.pdfIn PDF document text
    • http://jabomur.goldengobletrestaurant.com/uploads/1/3/0/7/130738681/voritiju.pdfIn PDF document text
    • http://fivawe.canyonrunner.com/uploads/1/3/2/7/132740362/5656547.pdfIn PDF document text
    • http://gijev.grrlsmeatcamp.com/uploads/1/3/1/6/131606069/b3b9bcfbc363.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9250/2437/files/ridemelebowuwirozotaxeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8260/2904/files/kaisi_yeh_yaarian_episode_29.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7831/4905/files/44270835927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b471d6ef-958b-4522-999c-cedddf10ace4/ravip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a615f8-768e-467b-9656-45bdcbdb4d20/kukeliliwejufebifobujol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777f1c80-5e49-46f4-ad0b-5682f3aecb11/kanoruvilorasidijojefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0296e8f-9476-495e-891a-7ef9f3eceb3e/68843998627.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5349 5380 bytes
SHA-256: c767bccb9367bc6006f07829ccd4d4c76b6a79b62b13eb6ff6bacaf33a855643
font_01_sfnt_off00006571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6571 14756 bytes
SHA-256: 1a8a16208797b8c6c55345344389d332a3d96d8e7e5e4d58ad943a7f804299d5

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