Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba20fdcaa0934e8…

MALICIOUS

PDF

53.6 KB Created: 2020-08-06 23:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a94fef833970c5f07513e1034ce2a7 SHA-1: 93e9093c44fa707bbfee7f084e2701cbf00c0c9c SHA-256: 0ba20fdcaa0934e8034035acab3fdb50d2958af62fd5c136f858e0391751eea8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to the same malicious URL, suggesting an attempt to disguise malicious content as an educational resource. The ML classifier strongly indicates 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://ttraff.ru/pify?keyword=breakthrough+plus+2+student+book+pdf
    • http://files.reedertranslation.com/uploads/1/3/1/3/131384127/sogolemu_zusabexagovofab.pdf
    • http://files.firstchristiantexascity.org/uploads/1/3/0/7/130775743/8416b5bebbe7e.pdf
    • http://files.tmpmentoring.com/uploads/1/3/1/3/131381900/7574543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9516/2022/files/11866043274.pdf
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/28295517077.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/decrease_file_size.pdf
    • https://cdn.shopify.com/s/files/1/0435/6780/8667/files/xodowilogumilijixuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/74894071472.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1923/files/taratuzorasezodikibal.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/zelapavoradoz.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/bafeleviziwokaxek.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/mamavomogawu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/ctet_question_paper_1_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/4309/4677/files/pevumabepetofobako.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7310/files/68119607202.pdf
    • https://cdn.shopify.com/s/files/1/0429/5199/9637/files/tapekefunevum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/70920001738.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_off0000913b.bin
1f68f047cf0f4983073678a308e3fc419c037b7b8aac870de90025dfa98e15ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913B 5688 bytes
font_01_sfnt_off0000a48d.bin
43631e9739f7803b324d2b45a064f0a423f4bf01e32c2546a9810bacec206993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA48D 10732 bytes

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