Malicious PDF — malware analysis report

Static analysis result for SHA-256 c933b3793c7effc8…

MALICIOUS

PDF

33.6 KB Created: 2020-09-05 08:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dbf61d48069271fac157c58491eb4be SHA-1: 6cc67086db50c5707d8956b9537495642e20078f SHA-256: c933b3793c7effc8e5344eaae45edee46667448e3eff108f32f9755cabfdcfba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, with one critical heuristic identifying it as a malicious redirector. The document body includes a URL that points to a redirector service, which is likely intended to lead the user to a malicious site. The presence of many external PDF links suggests a link farm or SEO poisoning tactic to increase visibility and clicks. No scripts were extracted, but the primary attack vector appears to be social engineering through deceptive links.

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.me/wix?keyword=lyrical+trumpet+solos+pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2004/files/lunubomizasukovorixitas.pdf
    • https://cdn.shopify.com/s/files/1/0440/6122/9206/files/alpinia_galanga.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kuvesagapixunijibofalase.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/cataract_ppt_free.pdf
    • https://static.usrfiles.com/ugd/90423f_8a28dda15b73473ab8a27e8fb5c2aca8.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/45566892047.pdf
    • https://cdn.shopify.com/s/files/1/0430/2887/3367/files/5110609605.pdf
    • https://cdn.shopify.com/s/files/1/0440/4926/8886/files/dudejugakakukajopab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/20238432523.pdf
    • https://cdn.shopify.com/s/files/1/0435/7442/7811/files/84434064760.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004460.bin
347e1e9b6153d305e92b11d06c7906c7f8e474f542aeff84a77e40c915c325b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4460 5344 bytes
font_01_sfnt_off00005684.bin
fc5ce13f3d51d63feb11452a204574ed974db692581ee225672f96202d162032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5684 10492 bytes

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