Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14d852d14be189d…

MALICIOUS

PDF

45.5 KB Created: 2020-08-30 05:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caf1da496a2432fe7dd86d4e06bb5e57 SHA-1: 5ae5fb8822ec6725da0f1c2b72f8aeda29ce576d SHA-256: f14d852d14be189d467cb1445ef61a95bc7431c181c8d35c41878cbff246cd4d
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URL 'https://ttraff.cc/wix?keyword=edtpa+task+3+examples' is a primary indicator of this malicious redirection. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and embedded links indicate a phishing or redirection attempt.

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.cc/wix?keyword=edtpa+task+3+examples
    • https://cdn.shopify.com/s/files/1/0430/2992/1943/files/puxupi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6642/4477/files/pexusinasipigipoluzopodep.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6430/files/53895962915.pdf
    • https://static.usrfiles.com/ugd/a31856_aa55239d0d4b49368454d55923d3e328.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c6230a38605477197fdd2c6bfb057e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_72020fa966ed421cae4e09872c55cac4.pdf
    • https://static.usrfiles.com/ugd/136d07_f0ab33e747534e02be0a651615efb2a9.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/79411733487.pdf
    • https://cdn.shopify.com/s/files/1/0430/0744/3103/files/67891612381.pdf
    • https://cdn.shopify.com/s/files/1/0452/5621/2640/files/amisom_in_somalia.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_off00007521.bin
1a5d03c443527a5227c7ac20cf69b2b9015f750dbd98b802679eab1f77f40972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7521 5260 bytes
font_01_sfnt_off00008700.bin
45037524feaf46e378d90061918c9cab70579bf92873c6ba60a96ffae8e2af9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8700 10156 bytes

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