Malicious PDF — malware analysis report

Static analysis result for SHA-256 6752b3cbc8e8be40…

MALICIOUS

PDF

40.9 KB Created: 2020-07-31 10:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 761eab61300cdf3289bdf0509ede1fcf SHA-1: 6372d429337c521ed92d480da3028f8fa78d9377 SHA-256: 6752b3cbc8e8be40991f44d6cd929a232c7e340853c0d24b3ed8ab994c49a557
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 to external websites, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or distribute traffic to malicious sites. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext, further supported by the presence of embedded URLs.

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.ru/pify?keyword=professional+boatbuilder+magazine+pdf
    • http://files.northopchurch.org/uploads/1/3/1/6/131606393/razapexida.pdf
    • http://files.oonaghmcdonald.com/uploads/1/3/0/7/130740625/1092232.pdf
    • http://files.karizmaconcerts.com/uploads/1/3/1/3/131380029/1290954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.pdf
    • https://cdn.shopify.com/s/files/1/0435/6990/5825/files/zodaruvafemomifit.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/73842840927.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/71198829096.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/sirifinurigokin.pdf
    • https://cdn.shopify.com/s/files/1/0428/8095/8617/files/16430844509.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/42376439293.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7299/files/5974567766.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/vuzalij.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/norojakibi.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_off0000624c.bin
10973611d2df882bd48ea2fceeab7107808df8efb6981e5826f7054c7aabeb62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624C 5436 bytes
font_01_sfnt_off000074a3.bin
8ef101084583fc4eebb085ae7dffb8dc3b21392ea6da214956e49ddb8d1fe4cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74A3 10008 bytes

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