Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac87a26acc025c2…

MALICIOUS

PDF

74.4 KB Created: 2020-07-09 01:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50c5ab14fba9160d8e4854c88023b005 SHA-1: dea3bcda4e033455d89c8c78aec2d3f5648f0d99 SHA-256: 6ac87a26acc025c23464cb5b59d910e73a272e968342cc8c09c25238d726017f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, indicating a link farm or SEO spamming operation. One of the initial links directs to a known malicious redirector, suggesting a malicious intent to lead users to harmful content. The document body is heavily obfuscated and contains a URL that is also present in the link farm.

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.cc/wb?keyword=manual%20siconv%20ajuste%20plano%20de%20trabalho
    • http://files.vk3sn.net/uploads/1/3/1/8/131871894/d40f274a4b81b4.pdf
    • http://files.nrisa.org/uploads/1/3/0/8/130874307/6503910.pdf
    • http://files.groundedlearning.com/uploads/1/3/0/9/130969532/2435414.pdf
    • http://files.crlangille.com/uploads/1/3/0/7/130775520/movefu-sipaziguxu.pdf
    • http://files.thirdcinemaproductions.com/uploads/1/3/1/3/131379749/sonazez.pdf
    • http://files.mplsalpineski.org/uploads/1/3/0/7/130775341/lekafinigijuwupob.pdf
    • http://files.heavygrail.net/uploads/1/3/1/3/131380733/bitat.pdf
    • http://files.iwfgeorgia.org/uploads/1/3/1/4/131455883/dofez.pdf
    • http://files.jjeffreymesserole.com/uploads/1/3/1/3/131384018/f3faf9c41e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://womonuxad.files.wordpress.com/2020/06/17415223723.pdf
    • https://lobetaxaj.files.wordpress.com/2020/07/tebimolemudugujopezil.pdf
    • https://zaxogetareko.files.wordpress.com/2020/07/zuxokumuxifufadobe.pdf
    • https://zunuxav.files.wordpress.com/2020/07/sajel.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunumegosuvuvorewufo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.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_off0000e018.bin
df8d0c35c5793809c9c9801c764b5ca919e90f6ef7a2dfd7827be121b2f33c2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE018 5324 bytes
font_01_sfnt_off0000f224.bin
17b33b9520d46c7435dcc77e5e6a711e82a779df82365d472e1b6f4be88e9f78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 13824 bytes

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