Malicious PDF — malware analysis report

Static analysis result for SHA-256 775674851a5ec3d3…

MALICIOUS

PDF

53.0 KB Created: 2020-07-31 08:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caba52c0058e992ca1668f8758fbf3fb SHA-1: 50f2184795669e6676109ff7bc71800df61e85e2 SHA-256: 775674851a5ec3d3a1b8a6793ae50c9ca303d1d157c215d6e2f98b10a5cb171e
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 heuristic specifically identifying it as a PDF SEO link farm. One of these links points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous links suggests an attempt to direct users to potentially malicious content or download sites.

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=causas+de+hiperaldosteronismo+secundario+pdf
    • http://files.viktorcage.shop/uploads/1/3/0/7/130738572/469e63f.pdf
    • http://files.trebalmusic.com/uploads/1/3/2/7/132741339/figogoriro-voziriz-dejijuvur.pdf
    • http://files.zeroinfections.org/uploads/1/3/1/6/131606165/7481829.pdf
    • http://files.andrephotography.net/uploads/1/3/0/8/130814397/moxibudepa.pdf
    • http://files.shoplockettlashes.com/uploads/1/3/0/7/130739116/3332840.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0853/9299/files/laxafodorawe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7510/9013/files/rawag.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/sisebusaxiwipavosejeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/neneparosasivikavojuf.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/lilasaxubum.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/keposenu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9557/3158/files/jupibereridapisideb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3039/files/nulapuwelis.pdf
    • https://cdn.shopify.com/s/files/1/0438/4574/6838/files/17437747179.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/dabedetubeges.pdf
    • https://cdn.shopify.com/s/files/1/0437/0831/7850/files/navikubodim.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/fokosezetavavotida.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_off00008fdc.bin
6a9ca0dd2b8f461958e2346b657de998f73578b50528ca8140df26b3d6f989da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDC 5300 bytes
font_01_sfnt_off0000a1b2.bin
771ce8a183c40bfc2d651fcf783a452bb9bb575f42794612bd78ac8ac46dab25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1B2 11228 bytes

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