Malicious PDF — malware analysis report

Static analysis result for SHA-256 0876ee0c7258ce24…

MALICIOUS

PDF

46.0 KB Created: 2020-08-30 15:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a80ae63c95bc699b71c6d3a24c5b2489 SHA-1: 99651cb271adc251837769d80aac776fb998695a SHA-256: 0876ee0c7258ce24bfb956f13bee20d484f8a7f6970940969a68c1595fd6ab64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO manipulation tactic. Crucially, one embedded URL, 'https://ttraff.ru/wix?keyword=diary+of+a+country+priest+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to potentially malicious content through a deceptive link structure.

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/wix?keyword=diary+of+a+country+priest+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/chuyn_file_nh_sang_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/double_digit_addition_with_regrouping_printable_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0438/6032/8608/files/39136404071.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/zidaxasofawikumosiduzu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/40111349514.pdf
    • https://cdn.shopify.com/s/files/1/0431/6741/6488/files/befuwagunelalotupivu.pdf
    • https://static.usrfiles.com/ugd/41a0b6_cc787eb6e7314821af251f05dd94b04d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e6a3929249e468a8f60bc57758d863e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c9d57dcd7644dde94f476682f9c551f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e7c9c0c6b8a4e9dac1d6d36128f7545.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_off000075a9.bin
6902de8b8755198ce557c570e4dccd8811ee5e0f914ce27ac069e56679a0a873
pdf-font-stream PDF embedded font (sfnt) at offset 0x75A9 5220 bytes
font_01_sfnt_off00008783.bin
f1bdc8aa6549d0731ac144060d1f45d2af92dd8d5daccb0fd5f5707d5de69b95
pdf-font-stream PDF embedded font (sfnt) at offset 0x8783 10564 bytes