Malicious PDF — malware analysis report

Static analysis result for SHA-256 051bdb92b61eeca0…

MALICIOUS

PDF

45.9 KB Created: 2020-08-05 08:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a347e36d82b564142b13fff310f9e9a SHA-1: bab21627dff1abafaf9a0d0960781c6a4d5b04df SHA-256: 051bdb92b61eeca0910372e87f3da76692d65e9763a938ec1834992a4caeab7c
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, disguised as a 'benevolent fund form'. The document body and embedded link objects contain numerous URLs, many of which point to potentially malicious or unknown domains, suggesting an attempt to redirect the user to a malicious site. The presence of a 'download button' lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=benevolent+fund+form+2020+pdf
    • http://files.digi-kits.com/uploads/1/3/0/8/130815026/rupilamawe_jegarigodule.pdf
    • http://files.schematherapycanberra.com.au/uploads/1/3/1/3/131383771/76303e.pdf
    • http://files.joyfullyyours.net/uploads/1/3/1/3/131381799/nokokalevex.pdf
    • http://files.nmuralikrishnan.com/uploads/1/3/1/3/131379553/merebisibapavor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/32053726160.pdf
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/prentice_hall_literature.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/3_storey_school_building_design.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/30228114946.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/senuluketisaxikax.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7637/files/99059980649.pdf
    • https://cdn.shopify.com/s/files/1/0440/9848/6424/files/34582278914.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tokon.pdf
    • https://cdn.shopify.com/s/files/1/0435/3730/1653/files/11909343132.pdf
    • https://cdn.shopify.com/s/files/1/0432/3619/6507/files/17649210196.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/89011491671.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006983.bin
23ac19eb40418a0d107cac26ce34bb26d008177cedf371b5a0473dc458d6e383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6983 5180 bytes
font_01_sfnt_off00007b15.bin
72a3fe65f0a21df30f240897224061cfa351088b80a4eb601fb5defb198ec993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B15 2268 bytes
font_02_sfnt_off00008527.bin
9c96648e4e0346bba627006b8876be57ec5afa69dc923ababeb1ca554623ebbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8527 10924 bytes

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