Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fbef0d51926f14…

MALICIOUS

PDF

40.9 KB Created: 2020-07-29 22:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4510e3608ac2ef3e54f8a5c0fc874fd SHA-1: 71a36f56d6cc9799b29c5f6e5338e925dd539db9 SHA-256: 00fbef0d51926f14aef69db44e773b8dd6e32532badd5e7b98c45ba1dfd705b9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service that is known to host malicious content. The primary redirector URL is designed to lure victims by appearing to offer educational material. The ML classifier strongly indicates maliciousness, and the link farm behavior is a common tactic for distributing malware or phishing 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=mathematics+today+grade+7+learners+book+pdf
    • http://files.doulasinatlanta.com/uploads/1/3/1/4/131453355/7ade6.pdf
    • http://files.marmascairnterriers.com/uploads/1/3/0/7/130740412/fijiw-jipodusudat-surifa.pdf
    • http://files.restyledlife.com/uploads/1/3/1/4/131438439/72bad43b8168c.pdf
    • http://files.arhstyles.com/uploads/1/3/0/7/130740189/183326.pdf
    • http://files.carolinamountainreefs.com/uploads/1/3/2/8/132814306/lanuzibizenub_pimulu_motazosapijulek_jazidodirul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5720/9766/files/6022395562.pdf
    • https://cdn.shopify.com/s/files/1/0434/6540/8662/files/68347373932.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7247/files/46436225489.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9711/files/76836841526.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/50464963078.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/zamasalufapovobajipatuzox.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0936/files/17888052570.pdf
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/bedudaloromogad.pdf
    • https://cdn.shopify.com/s/files/1/0435/9274/5117/files/20612112741.pdf
    • https://cdn.shopify.com/s/files/1/0434/5823/2473/files/zetidorogubifomabibenuri.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/totavari.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5074/files/3007071960.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_off000060e6.bin
ff1630cdcf6ceeecc4d91c9d9c4195a4b820b48f032a6d2edf42d725160a3aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60E6 5748 bytes
font_01_sfnt_off00007463.bin
5efe924e0ff87bc490f03ca432a238816e6565ed196bb5e656cc37541d346be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7463 9796 bytes

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