Malicious PDF — malware analysis report

Static analysis result for SHA-256 731c2a74cae27053…

MALICIOUS

PDF

39.0 KB Created: 2020-10-27 08:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e1c558263d76acbb3c7e3092808af57 SHA-1: 1db227946b0d0a000934aedc83fc105562965960 SHA-256: 731c2a74cae27053374cbdbdde643c763d49987896e9e62a41629526bca352d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing campaign, aiming to direct users to malicious infrastructure.

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://cctraff.ru/strik?keyword=flip+ultra+hd+wont+turn+on
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/gelogerubusef_dikanisavubef.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/665f945f0e.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdf
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/9462329.pdf
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/55104dff.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/7db18b9465.pdf
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/5a118d9bce47e8.pdf
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/9512461.pdf
    • https://cdn-cms.f-static.net/uploads/4388160/normal_5f975502d5110.pdf
    • https://cdn-cms.f-static.net/uploads/4420476/normal_5f9786c9d17ce.pdf
    • https://cdn-cms.f-static.net/uploads/4374986/normal_5f8edb7a1a980.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ronenitevodo/nojogurop.pdf
    • https://s3.amazonaws.com/gulapore/83996308278.pdf
    • https://s3.amazonaws.com/vaxebisapesi/71472882308.pdf
    • https://s3.amazonaws.com/henghuili-files2/29008909471.pdf
    • https://uploads.strikinglycdn.com/files/e1b87cdd-2c2d-4b66-af87-7624669cf794/sagebonoxusajezefur.pdf
    • https://uploads.strikinglycdn.com/files/8d00a5bb-0f70-44c2-8861-340708209005/best_essay_writing_service_yahoo_answers.pdf
    • https://cdn.shopify.com/s/files/1/0480/7026/2948/files/saxon_algebra_1_2_answer_key_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0483/0740/4963/files/reading_test_for_grade_1.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.

FilenameKindSourceSize
font_00_sfnt_off00005b01.bin
ec4d19adbe6d3b579053e7319c483ca21a4573d1a979f31d627f1ce88a72e31b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B01 4916 bytes
font_01_sfnt_off00006bc3.bin
75ee74f32058c05b2452a11c4d67820693285a5647293639fb349333a759222c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BC3 10340 bytes

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