Malicious PDF — malware analysis report

Static analysis result for SHA-256 08239ca05fb54d31…

MALICIOUS

PDF

43.9 KB Created: 2020-08-31 06:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c08fd2ba73207e5d17f92b944ce194f SHA-1: 9e7a916f05c752771df6b8e88130a4b2c031834c SHA-256: 08239ca05fb54d318333531bd4a5c061fa7422ef22339f735875272f1e482aa1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify-hosted PDFs, which is indicative of a link farm or SEO poisoning attempt. One of the primary links, 'https://ttraff.ru/wix?keyword=is+pdf+online+safe', is flagged as a malicious redirector. This suggests the document's purpose is to drive traffic to malicious infrastructure, potentially 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/wix?keyword=is+pdf+online+safe
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9816/8727/files/20371189623.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38743570217.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3655/files/various_definitions_of_language.pdf
    • https://cdn.shopify.com/s/files/1/0462/5507/9573/files/12169395895.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/zagamebesuvuba.pdf
    • https://static.usrfiles.com/ugd/98e298_1a42cf2f2c2342c5b10ebee00875537c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5def78df6d9a4c24803373e69d6f63c3.pdf
    • https://cdn.shopify.com/s/files/1/0428/4956/6886/files/resistance_and_reactance_of_transformer.pdf
    • https://cdn.shopify.com/s/files/1/0461/7486/3513/files/army_police_background_check_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/2260/6759/files/xebenafugukabotaxitoguwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/behringer_xenyx_1204usb_driver.pdf
    • https://static.usrfiles.com/ugd/b8c837_e364d45b16e04f329ad911d09b74ddfa.pdf
    • https://static.usrfiles.com/ugd/0c41e7_749e46619692491ba4e2dc20f4c22b75.pdf
    • https://static.usrfiles.com/ugd/253000_6fbcd4b5a5344630be9bb48e0bff51a4.pdf
    • https://static.usrfiles.com/ugd/b58d21_c12b24ead8ee4d2781c09c2fb34981cf.pdf
    • https://static.usrfiles.com/ugd/96768c_1f244215b07d4e2f91bcf2fed7087651.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_off00006d72.bin
ad36aac16b2042bd7270e72aada345bf87919067cd01657930ff67ceecff2169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D72 4876 bytes
font_01_sfnt_off00007e14.bin
70afbbd86b8b6123e33a703965b4e2520f22051f0e7f5527b06cdbe77a42d7ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E14 10908 bytes

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