Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b6c8f21a734eb7…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 19:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85d3b9bfe67faea2e4f66f2ef975af3f SHA-1: 041bfd6620497424542698348bd680e5ea0617c2 SHA-256: 18b6c8f21a734eb787bf99b3d14d9108eba613e78451d239353b57d533c9d741
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure. It also exhibits a PDF link farm, with many external PDF links. The embedded URL `https://ttraff.cc/wix?keyword=transistor+d882+pour+que+sert` is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=transistor+d882+pour+que+sert
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_8c206f1c44d043f999a4bb4ab4a159e7.pdf
    • https://static.usrfiles.com/ugd/fb83f1_76fb0b6ee4284f9f997a95d08abd1c83.pdf
    • https://static.usrfiles.com/ugd/05900a_2acacb5ad944400689520cc6be1a3d68.pdf
    • https://static.usrfiles.com/ugd/b91566_8121f4de6ed148c9a7223b9b34b7df8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb33a94129224f33a0713f8beccb0603.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b7f6d56d00a4744b1b7a919d099f89e.pdf
    • https://static.usrfiles.com/ugd/47b1e8_201c8af0fc6b4b188105a785cb32500a.pdf
    • https://static.usrfiles.com/ugd/6cfc61_b30bc349a33840f498c6e826ec870dda.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6a0ebf5e62b41959ccab27757b75fee.pdf
    • https://static.usrfiles.com/ugd/4d400c_146a160c7b724710a97d921cafec3f8d.pdf
    • https://static.usrfiles.com/ugd/af0aa9_3ef5db47b2f34e3888bbc96ded78f930.pdf
    • https://static.usrfiles.com/ugd/dd4472_25dc5353234a4c168087ba2d03b94c78.pdf
    • https://static.usrfiles.com/ugd/8a419d_f625eb80993641449a34f7439c9b7014.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ce7.bin
d4e0b2484977518ac65d478fdfcf86ae5a183c6190c5e600535bca891b683588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE7 3044 bytes
font_01_sfnt_off0000679d.bin
092af2bf5786d85013da4d6fa9162be64e560a5c8f06f5a6517436d2d75962c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x679D 5324 bytes
font_02_sfnt_off000079b8.bin
66b7f61405968ce17f0afb9225eb5453f65ac141659fdcd479d71dbecdae3ba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B8 10480 bytes

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