Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2289269aa9442a…

MALICIOUS

PDF

37.3 KB Created: 2020-08-31 14:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb7d482c218cbcdc96601a091946ecfc SHA-1: 24abb42a797ca5bbe0503fbc661f75d03847d2be SHA-256: 1b2289269aa9442a2c205b84384313e3565f24816517a79f387c831d0a50af31
152 Risk Score

Malware Insights

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

The PDF file contains a link farm and a specific URL pointing to a redirector, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains text suggesting a 'PNB chargeback dispute form' lure. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm it links to known malicious redirector infrastructure.

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=pnb+chargeback+dispute+form
    • https://static.usrfiles.com/ugd/c068f8_6ef050146b264531873f90b94aa9665f.pdf
    • https://static.usrfiles.com/ugd/ade4e6_65a8f4a4bfa647858210bb140d3d4416.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d5c156f420f4fbab58e508c15a4dbc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_451c29b0534c40898134d3f27dac7462.pdf
    • https://static.usrfiles.com/ugd/1849a1_a5112168da794a6ea1e93a9916b1f6fe.pdf
    • https://static.usrfiles.com/ugd/738632_fb9d4820311240d28b7c2c12fe77b36e.pdf
    • https://static.usrfiles.com/ugd/b8c837_84e7eea281714fa3a1c0a06a05a3401c.pdf
    • https://static.usrfiles.com/ugd/5b9a87_6deeae65a6c14157a54e0921bad6a17c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2b9532331dc4e2fb6faa92178c372c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_01f2fd2444b2434586ba0b0969919ead.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_off0000521e.bin
540c078d2d0ff50e6b3c479387ab801ff7fccd9509bfac574d6568fa4f6a7a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x521E 5744 bytes
font_01_sfnt_off0000657e.bin
cd18aabc0969aacce59573bb5f86873b5661eea221ec191ee2f2787c48ce8258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657E 10340 bytes

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