Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce33447450cfdb8…

MALICIOUS

PDF

40.2 KB Created: 2020-07-12 13:39:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1c38359018b1b475b3548388a31f20f SHA-1: ed5ac87982471ffbe55a99a25070c3fef57f8417 SHA-256: 7ce33447450cfdb88499c7a7d29734e26e05db6dc8234d2df2430ef205941330
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wb?keyword=ac%20joint%20pain%20exercises%20pdf'. The document body itself is heavily obfuscated and contains the same URLs, indicating a deliberate attempt to disguise the malicious intent. No scripts were extracted, but the presence of the redirector link is a strong indicator of malicious activity.

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.cc/wb?keyword=ac%20joint%20pain%20exercises%20pdf
    • http://files.francoisdesign.com/uploads/1/3/1/6/131606674/1b188ce7defe.pdf
    • http://files.zaitoldme.com/uploads/1/3/1/0/131070938/d799ddf32.pdf
    • http://files.eviman.fi/uploads/1/3/0/8/130814342/tukipevidulodeboda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81397135942.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mirogorozizodixomalejog.pdf
    • https://gepuwovu.files.wordpress.com/2020/06/39210398804.pdf
    • https://suxeniruwip.files.wordpress.com/2020/07/tutujelerefoza.pdf
    • https://dokukikudif6291172.files.wordpress.com/2020/07/luxazujutazuletanogo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/63517780522.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/boxulesikotomososup.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/8917749958.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86562581376.pdf
    • https://cdn.shopify.com/s/files/1/0431/2609/6036/files/feworemasawopezegusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/35362843850.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/punegavusitenoge.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48975286879.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/furufewojob.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vibemegabixowosepabotabux.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_off00006027.bin
cc7ecd9d1f7aef65918db0791bf3e485ec276f952003367b6415ae674ff09a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6027 5036 bytes
font_01_sfnt_off0000714f.bin
4308621e4cbb39ec7eecfa70b5286e81b9795df4e3395fd89bde367fd8ea104b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714F 10152 bytes

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