Malicious PDF — malware analysis report

Static analysis result for SHA-256 603fd8b3c57ad4e8…

MALICIOUS

PDF

44.5 KB Created: 2020-08-04 09:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 138ea928ca762d4eb9ccca2869137d43 SHA-1: 2781a4abc672d11e4a7760e5c20844e0dc8f4825 SHA-256: 603fd8b3c57ad4e86a52f72399445362ed045426e13dbc8fb420733d38d75f35
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The primary link, https://ttraff.ru/pify?keyword=eight+characteristics+of+research+pdf, is identified as a malicious redirector. This indicates the document's purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=eight+characteristics+of+research+pdf
    • http://files.jspublishing.org/uploads/1/3/2/3/132302919/4266847.pdf
    • http://files.jemmaday.studio/uploads/1/3/2/3/132303351/nawibed_zuwunogobu_mujotexotaw_kanevuvatisa.pdf
    • http://files.amsterdamclassictours.com/uploads/1/3/1/1/131163590/bepujevikiked-kinodel-wiwemasinisogol.pdf
    • http://files.discoverwarman.com/uploads/1/3/0/7/130738657/e7ab7b7a0c0f8d.pdf
    • http://zodepuwir.aisigcsescience.com/uploads/1/3/2/6/132695329/zimerete.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/20514877998.pdf
    • https://cdn.shopify.com/s/files/1/0429/2126/3271/files/wibekawasozerojenijaguwus.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nitopufekuriwuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0888/files/tuxeka.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0440/0611/3430/files/pamebatuwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/tikofikudakibamevakugimep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6974/2999/files/siladiwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/mevefafinoxitevi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97253363073.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9213/files/21472693355.pdf
    • https://cdn.shopify.com/s/files/1/0430/9978/3319/files/85564304312.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_off0000702a.bin
447ec3110e8d40d17df4b14e884309c454ce6fcd399eaebb0add7015683bbf00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x702A 5340 bytes
font_01_sfnt_off0000825b.bin
f2a5fff638044cf5d82c94a17c33a933a17effb06be1c78fb0e87131c2550916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825B 9992 bytes

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