Malicious PDF — malware analysis report

Static analysis result for SHA-256 532fd3b004bb45ec…

MALICIOUS

PDF

62.9 KB Created: 2020-07-08 16:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fb34f168b820de0810d0797c544c54f SHA-1: 619fc6c1c979ec9a9a0f6030bfeb8d3e588058c9 SHA-256: 532fd3b004bb45ecde0cc73406950cefb9ee1e93fd8a51c85c936e502ad3d416
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains keywords and URLs suggesting a lure to external content. The primary attack pattern involves directing users to potentially harmful external sites through a 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.com/wb?keyword=drumming%20rudiments%20pdf
    • http://files.ambitupstate.com/uploads/1/3/0/9/130969386/9608386.pdf
    • http://files.shearserenitysalon.com/uploads/1/3/1/3/131383553/53b9878d6b0f11.pdf
    • http://files.sachagrosselart.com/uploads/1/3/0/9/130969209/belizifimekedaxuwuzu.pdf
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdf
    • http://files.sugarbakeshopperi.com/uploads/1/3/1/4/131414516/9218830.pdf
    • http://files.musicatmainstreet.com/uploads/1/3/0/7/130739839/davetuxu.pdf
    • http://files.magiqatlas.com/uploads/1/3/0/8/130814513/zivatemurijupizowigi.pdf
    • http://files.orangevalleycreations.com/uploads/1/3/1/3/131383510/bujofaketuwomidabej.pdf
    • http://files.paramountrec.com/uploads/1/3/0/7/130775827/wanuvawofi.pdf
    • https://vusuletameta.files.wordpress.com/2020/06/ropoxet.pdf
    • https://fogojifoxuni.files.wordpress.com/2020/07/boxevaxawibakab.pdf
    • https://nabelijun.files.wordpress.com/2020/06/zofeviwiwaxuvifetu.pdf
    • https://foburabowo.files.wordpress.com/2020/06/77639875597.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76588695657.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba7d.bin
5f48326beb91f5cf3fe5c0056aa7d6264f2b8034f145025c907df77bdf26d8e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7D 4888 bytes
font_01_sfnt_off0000cb03.bin
f62ed35fc714021e55d42d869bcf173d9bdbf98fb8acc9fbec0381ce2d411e9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 10580 bytes

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