Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2944a258f54ed40…

MALICIOUS

PDF

46.9 KB Created: 2020-07-31 01:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1e54e76d8b4bb7195701e9ae871763f SHA-1: 60b607fcc6619d6907cf69255ed7b3b419f76f34 SHA-256: c2944a258f54ed40c3b9c5880f612b99f8231c29d1a29c66d9679ca32013821f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One of the primary links points to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, often used to create fake documents for phishing or malware delivery. The presence of a malicious redirector URL is the highest priority IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=thomas+calculus+11th+edition+full+book+pdf
    • http://files.lauramernoff.com/uploads/1/3/0/7/130775654/3cdc9bb88a09.pdf
    • http://files.heatherwarren-crow.com/uploads/1/3/1/8/131871439/3bb44423ced.pdf
    • http://files.reactextechnology.com/uploads/1/3/0/9/130969915/aaac0f60f1fe498.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/99173146577.pdf
    • https://cdn.shopify.com/s/files/1/0432/2672/6568/files/466115158.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2089/files/farokufewatusuvaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/puzufobiboguruferulegada.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/6827277623.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/kilipuberozalijadunalox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/mejige.pdf
    • https://cdn.shopify.com/s/files/1/0437/9171/2405/files/pedevigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5791/3749/files/90454960164.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kusamusa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dutevitijenunolekegek.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5580/files/96943286865.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/
    • https://cdn.shopify.com/s/files/1/0430

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078b9.bin
0423e28b16f30095a12037936891d1b8e9f167cea8b5d28a330edb6089da4c61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B9 5384 bytes
font_01_sfnt_off00008ae2.bin
cef89a42e888d4567de90c7452ad9802893e280f368945535cab1f1a198734cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE2 10408 bytes

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