Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8908a280320a2f8…

MALICIOUS

PDF

39.8 KB Created: 2020-08-29 08:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23f258c3c639c717be70f84a2b7f9a1b SHA-1: 48231714d8351235e0ff7fb1633002ea729559b7 SHA-256: a8908a280320a2f809f43c5346fc3b4f4756110e51ae31860e6f8d90d2c9b6d0
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.link, which is designed to lure users to malicious content. The document body and embedded links suggest a phishing attempt using a 'school website' lure. The presence of numerous benign-looking PDF links hosted on Shopify, alongside the malicious redirector, indicates a link farm strategy to obscure the final malicious destination. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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.link/wix?keyword=albuquerque+high+school+website
    • https://cdn.shopify.com/s/files/1/0458/1258/0518/files/bixepe.pdf
    • https://cdn.shopify.com/s/files/1/0449/7879/8750/files/44900017589.pdf
    • https://cdn.shopify.com/s/files/1/0430/7589/5450/files/18004149616.pdf
    • https://cdn.shopify.com/s/files/1/0436/1981/1490/files/arte_greca_periodo_arcaico.pdf
    • https://cdn.shopify.com/s/files/1/0437/9767/6192/files/12817146201.pdf
    • https://static.usrfiles.com/ugd/b8c837_a7eadc1caf0b4c1e95814b6296c2172f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9431dcffb636424b802f7aac8940d8e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_44cef91b3e7e4b7b847f258b7b565b86.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/accidente_vascular_cerebral_hemorragico.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/35839556460.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_off00005b5e.bin
3008646a7b2dc8c5b51ddf128575799156c5a7ec8eb6da596c691a51eff8da37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B5E 5196 bytes
font_01_sfnt_off00006d13.bin
5a1e648abb607a098a86d3852d76185cbfd67e8f66d608d410fe3ff0cab05b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D13 11068 bytes

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