Malicious PDF — malware analysis report

Static analysis result for SHA-256 941c178abc69d5be…

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 23:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2068dbdc281523d298176b3772407d16 SHA-1: 08f7ad0dc1ae5e18c037088b8e4bc808710eb6e0 SHA-256: 941c178abc69d5be190c49ea8cebb7038a778172375e963a87fcb8d86d906851
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a book review, aiming to trick users into clicking it. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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.me/wix?keyword=diary+of+a+wimpy+kid+old+school+book+review
    • https://static.usrfiles.com/ugd/b8c837_835c1276d6614d6c9616b40e197738c1.pdf
    • https://static.usrfiles.com/ugd/0779a3_8e094ff621234137abb9384095071d71.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4bfb0dd6b0f4d5e8e6c4e3e37471460.pdf
    • https://static.usrfiles.com/ugd/c068f8_0fb4fba639b243cb839cb22f1bd03a65.pdf
    • https://static.usrfiles.com/ugd/c83fdb_a8c4e311e8c5405b9cb7bb325453e962.pdf
    • https://static.usrfiles.com/ugd/10b11f_cb7b9dcdaa854f06adda346bce363124.pdf
    • https://static.usrfiles.com/ugd/b8c837_db1ecebf702e4b2185c553b7d7f6d18e.pdf
    • https://static.usrfiles.com/ugd/accd1f_9eb324086c4240f2aa2af94668a199ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad2a0f22c7be40129c68c2f642b7d6ab.pdf
    • https://static.usrfiles.com/ugd/38bf1f_bb0e4c806d1247849eb71e9e7bf0741d.pdf
    • https://static.usrfiles.com/ugd/b8c837_32a12841d5254b648acbf60ff0a1acdd.pdf
    • https://static.usrfiles.com/ugd/b8c837_71122891b4c64d9488dcbdef0f8eca2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d850ccd029d4e1cb951f54a314fe7d0.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_off000064a4.bin
3b5882f37e406c1b4c2a89c0f039ce06fd9c29acbecfbc712c8d4d08b2267269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 5852 bytes
font_01_sfnt_off00007893.bin
0414d43593180572641efc35d58460998cf3c6be70ab924109e9fa550545ac87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7893 10552 bytes

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