Malicious PDF — malware analysis report

Static analysis result for SHA-256 6068cbf4a6b697fd…

MALICIOUS

PDF

32.0 KB Created: 2020-08-29 15:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9315b19ef4f68cc978ea77f39782221a SHA-1: 3bbf70954eb88d26fa0afdb3ce037ed6ff84f9d5 SHA-256: 6068cbf4a6b697fdaee2858e92206907f79f07c110eb2bbe7c7e7499658c07c0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector, ttraff.com, which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'IELTS placement test' and the malicious URL, suggesting a phishing or scam lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content.

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.com/wix?keyword=ielts+placement+test+with+answers+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5361/2199/files/87605298852.pdf
    • https://cdn.shopify.com/s/files/1/0433/5943/6968/files/3472812101.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/86128426215.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3576/files/xoruvuburu.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8a828d5db344b34b4a16364c9714aa7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b6aa1f6836a47dfb7b7df5241736d61.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dfc249b14ab4e81a7130869703d6bdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_aeebd7db88c8442e936308865a7e3e88.pdf
    • https://cdn.shopify.com/s/files/1/0428/3239/6447/files/3711294162.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/80131322759.pdf
    • https://cdn.shopify.com/s/files/1/0443/1210/1020/files/aptitude_important_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/mu_cv_p_file_word.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_off000041c9.bin
dfaa15b24d95bca54c022f8e0286e8ddc944f3ed8bf90a7d9fd3b7e0f6b2a5a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x41C9 5424 bytes
font_01_sfnt_off00005412.bin
cd9a57a5cfdf1b15df4a674a93bc49775758b9cee5f616d2a0e1a04e62a21377
pdf-font-stream PDF embedded font (sfnt) at offset 0x5412 9152 bytes