Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bcfc98c22d7830…

MALICIOUS

PDF

41.8 KB Created: 2020-08-10 23:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e902a446c0d40bd9221c40f979c7ba14 SHA-1: 66e9bf819fa4210e32ff8bc8851b1bbe4006d45e SHA-256: 94bcfc98c22d78301ec33fd51d57b2efa31ae4e696ca856105e285fc7f1ebd0e
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, ttraff.com, disguised as a tool for citing PDF files. This is further supported by heuristics indicating a malicious redirector and a link farm. The document body, though heavily corrupted, contains the text 'How to cite a pdf file online' and the malicious URL, reinforcing the phishing lure. The presence of numerous embedded links, many pointing to shopify.com, suggests an attempt to obscure the malicious redirector and potentially leverage SEO tactics for distribution.

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/pify?keyword=how+to+cite+a+pdf+file+online
    • http://files.sweetarrowfarm.com/uploads/1/3/0/8/130814601/a99885e3df4d844.pdf
    • http://lubasaru.erictroseth.com/uploads/1/3/1/4/131407148/9935650.pdf
    • http://kuben.collaborativemathematics.org/uploads/1/3/1/1/131163599/6560383.pdf
    • http://files.annemariewalter.eu/uploads/1/3/1/1/131163747/0bf143298.pdf
    • http://files.littlelotuswellness.com/uploads/1/3/1/4/131405977/xuxagit.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/goxunin.pdf
    • https://cdn.shopify.com/s/files/1/0431/1053/1238/files/wabedapuxinezusad.pdf
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/apache_lucene_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/2174/4803/files/fimikosariditubiwizu.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/bopabuvomukekumi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/17478477514.pdf
    • https://cdn.shopify.com/s/files/1/0432/4573/2007/files/24138510976.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3749/files/zoselaverox.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2931/files/dixuned.pdf
    • https://cdn.shopify.com/s/files/1/0430/8746/2551/files/kanelorabofero.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_off00006810.bin
9608e83056fb178b334251af2eb27b93331010e67962de3d957acc2901696363
pdf-font-stream PDF embedded font (sfnt) at offset 0x6810 4928 bytes
font_01_sfnt_off000078f1.bin
ba5384f1c54f86416cdf1ea684f98ec05a20face6cb05827dc63714f72037f7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x78F1 9868 bytes