Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4a54dde36c66b0…

MALICIOUS

PDF

43.6 KB Created: 2020-09-04 16:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dde9161400e09a43aacc24330e25c9ed SHA-1: 00e8899e2c46d498737c563e65bb8a35c6cef730 SHA-256: 3f4a54dde36c66b02e455bfcc37973d39820100a6424018b3007c1344a2764d1
152 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDFs, with one primary link leading to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggers the redirection, suggesting a lure to a malicious site. No scripts were extracted from this sample.

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.club/wix?keyword=what+are+antiscalant+chemicals+pdf
    • https://static.usrfiles.com/ugd/b7082a_cf67d17abf92435e8828c2ded42a5313.pdf
    • https://static.usrfiles.com/ugd/b8c837_d11437a55e144f4ba2404a42807a9aa8.pdf
    • https://static.usrfiles.com/ugd/c0a468_077528b9b3f64b15b8e4f027b856af22.pdf
    • https://static.usrfiles.com/ugd/affb4a_5d345c7e22484b44bf9de642171cecb4.pdf
    • https://static.usrfiles.com/ugd/9e14ca_733d493e2ee24d61955f9fc11c35937a.pdf
    • https://static.usrfiles.com/ugd/a31856_73cb32e52a1b46ef970f4fed75a8dfcb.pdf
    • https://static.usrfiles.com/ugd/36f25b_dcfed51ba59f477bb883787d8766903f.pdf
    • https://static.usrfiles.com/ugd/fa6f14_1aec9d13312c4f4d9f7ed55f908edf7e.pdf
    • https://static.usrfiles.com/ugd/6da380_2ffdaae0e6d44cfc89f2ae8e3ba68959.pdf
    • https://cdn.shopify.com/s/files/1/0439/4090/5128/files/agenda_21_brasileira.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7907/files/solving_linear_equations_word_problems.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2095/files/73357757465.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/47919041022.pdf
    • https://static.usrfiles.com/ugd/affb4a_b9dc640d673d41538735fb5ca0c346d0.pdf
    • https://static.usrfiles.com/ugd/1e8759_9c5cd636f8a949cea71a1d7628cc2196.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e0db41fab7a4f1fb25cba1e58049a61.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060b1.bin
ffc3b1fe6ddde93f6c7986ba146ff0b412a298e2dbec8acb9119cdaffb31c2e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B1 5084 bytes
font_01_sfnt_off000071cf.bin
d075ea80b39fd4db619b02872160c70b1ee1a04ec9b9b705eb7c84ef1359dc97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CF 9816 bytes
font_02_sfnt_off00009365.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9365 4324 bytes

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