Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bd457771fb4852…

MALICIOUS

PDF

40.0 KB Created: 2020-10-28 11:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfb3c37293369e4a84954d9bacb591eb SHA-1: 18ef6aa11b02e6f85504d030db7344578c3620cf SHA-256: c9bd457771fb4852f208fa04d74d41ea2cad7e422a6b4f96ff9752ea1a14c111
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to manipulate search results or distribute malicious content. No scripts were extracted, but the link farm and redirector heuristic point to a likely phishing or malware distribution attempt.

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://gettraff.ru/123?keyword=tempstar+serial+number+nomenclature
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5f944797b2b4b.pdf
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/6be82.pdf
    • https://vonolorijamitef.weebly.com/uploads/1/3/4/4/134452045/nijogudawezalu.pdf
    • https://cdn-cms.f-static.net/uploads/4384459/normal_5f91bcefaa70c.pdf
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5f8e1c37d3983.pdf
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/8c766a66.pdf
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/durafufoxo.pdf
    • https://cdn-cms.f-static.net/uploads/4381082/normal_5f98ef0317739.pdf
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/niviwedazisuxa_rekagokigasipas_rovozep.pdf
    • https://suragovitig.weebly.com/uploads/1/3/4/2/134265770/gofogugoge.pdf
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/papozamijul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zetare/mowatibomuposuwe.pdf
    • https://cdn.shopify.com/s/files/1/0268/9125/6007/files/bethel_woods_center_for_the_arts_wedding.pdf
    • https://s3.amazonaws.com/dozuga/35250325131.pdf
    • https://cdn.shopify.com/s/files/1/0498/7928/5915/files/chronic_obstructive_pulmonary_disease_copd.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9208/files/zofapeberejirexawur.pdf
    • https://cdn.shopify.com/s/files/1/0484/1016/5416/files/vanikepugamoxageba.pdf
    • https://s3.amazonaws.com/lewuli/les_grands_principes_de_l_amnagement_du_territoire.pdf
    • https://cdn.shopify.com/s/files/1/0501/4667/2805/files/ethical_humanism_definition.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_off00005fde.bin
a190098efa99d45bd65b72121b00a8fd80d6e38d7232bf7b52ce8987b3524ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDE 5168 bytes
font_01_sfnt_off0000714e.bin
140d0107ccb1e4b7eaaabbdfd878fcccacd43319478b378e18dc5dfa8e760623		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714E 9820 bytes

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