Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b4b8ff675adf7e…

MALICIOUS

PDF

40.0 KB Created: 2020-09-11 02:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0127bf9760d2ed410b58d2f75b5fa6e3 SHA-1: f1d5500e4d77c343ef6e5cf7d01168dc8ae8d8c1 SHA-256: 64b4b8ff675adf7edf230c19830f368cbfeba52102154725c37ec38536e47e5d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.com/wb?keyword=oxford%20dictionary%20of%20literary%20terms%204th%20edition%20pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search results or distribute content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext, further supported by the document body containing what appears to be metadata and URLs. No scripts were extracted, but the presence of malicious links and the ML classification strongly indicate malicious intent, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wb?keyword=oxford%20dictionary%20of%20literary%20terms%204th%20edition%20pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/gtx_1050_ti_passmark.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/babarolisuxa.pdf
    • https://cdn.shopify.com/s/files/1/0462/7539/5744/files/sutemimodisililizojewor.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/88907683087.pdf
    • https://cdn.shopify.com/s/files/1/0431/0011/0999/files/wixenujugev.pdf
    • https://cdn.shopify.com/s/files/1/0434/6154/2054/files/64430256713.pdf
    • https://cdn.shopify.com/s/files/1/0436/9298/2427/files/ctet_result_2019_marksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/fonibamole.pdf
    • https://cdn.shopify.com/s/files/1/0453/2790/9019/files/91373046736.pdf
    • https://static.usrfiles.com/ugd/9219f8_0fb513d705fc4fcf9cbfab4e487eea28.pdf
    • https://static.usrfiles.com/ugd/6cfc61_130e3addbffe4dffb420fca6bfe0caf8.pdf
    • https://static.usrfiles.com/ugd/26938b_ec4547299988421d9891a5dd4f5e0e72.pdf
    • https://static.usrfiles.com/ugd/b8c837_7766d10a3d1948df888cf8c94ca6f3d8.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_8fbc4765b24b46e99182ac129e2ef2e8.pdf
    • https://static.usrfiles.com/ugd/4b68be_11116fcc467f41f399ad7c8987de15ca.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_35a747650f124f05aed3b72a6086b999.pdf
    • https://static.usrfiles.com/ugd/2ca22b_171aae5c90ce4119adfe373b4af02274.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_54457ce24c09489e93b1f60329c5344e.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_off00005bfe.bin
a7778a63854c895ef218ca64fd2756fc95a1812190a241395733f758138ffa81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFE 5680 bytes
font_01_sfnt_off00006f38.bin
f1603416bf2572a07fb4394a6d119146d550b8cca8e009d2615a61e3f53881e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F38 10432 bytes

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