Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42bf26cb4502442…

MALICIOUS

PDF

38.5 KB Created: 2020-09-17 12:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cecd823d4200501b87d29df443d461f1 SHA-1: 029d1a8ab5a4ad108ecee6639434a4f0b4635cd6 SHA-256: b42bf26cb450244290c0ed7d483457ec6d2a9888a86f1047b40bdc84ee5c097e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as part of a link farm. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are likely intended to lead users to malicious content or phishing pages.

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.me/wix?keyword=advance+teacher+rating+system
    • http://voxexed.goodatlooking.com/uploads/1/3/1/4/131407226/lumumere.pdf
    • http://dilokup.coastalcaringclowns.com/uploads/1/3/1/4/131408172/158680.pdf
    • http://lerikubos.kcga4u.com/uploads/1/3/1/6/131636698/zuwig_buvaxolo_tisejudepibose_gujowerobi.pdf
    • http://zibujen.lakeodessaarts.com/uploads/1/3/1/4/131454215/tosivepekivo.pdf
    • http://divode.teacherlounge.org/uploads/1/3/0/7/130738667/975ed05b.pdf
    • https://a1bc42b2-6d86-456b-9623-a00ad7805edb.filesusr.com/ugd/f08e01_7ec4d03de11e4a60ba401b0d66244bcb.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/57195547659.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2822/files/80397712380.pdf
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/julius_caesar_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2039/files/13913451724.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/74310529479.pdf
    • https://147b0c94-c00b-453c-9d62-d5dced61b888.filesusr.com/ugd/154db6_f00fe5d4ca4a4ccb86b34727477c3f89.pdf?index=true
    • https://23d0a6c2-9f37-4951-9e44-0814be2deb06.filesusr.com/ugd/ad2ade_1940efd99cff4a908fc6d3add5e00cda.pdf?index=true
    • https://88c84fde-874b-47a2-8e10-d11ee69baca5.filesusr.com/ugd/28146e_a66babaf9c954508a4d59b75b967e420.pdf?index=true
    • 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_off00004c2a.bin
5f343398f8a851d2d5c9eed5d48cd3f5fc6b1c7cb30f568d024e972fdeb24044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2A 5148 bytes
font_01_sfnt_off00005d7b.bin
79a021ee6c93f07585c84072375e0a76956869545c24c164c201358550a050ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7B 9952 bytes
font_02_sfnt_off00007f33.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F33 4324 bytes

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