Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4f87d7af5dee43…

MALICIOUS

PDF

50.3 KB Created: 2020-09-12 04:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e58cb8a197f0490d98c29fda4bad77f3 SHA-1: 85b305bad6a2a994266fd9fec454f2e53d5ab8a8 SHA-256: 6c4f87d7af5dee43915baefdb2e2f0584d7481d10bf80488cbb2ff8f05debbf0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a PDF link farm. One of the primary links, 'https://ttraff.club/wix?keyword=naa+autograph+songs++teluguwap.+net', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary purpose is to redirect users to malicious infrastructure. No scripts were extracted, but the PDF structure and link farm heuristic strongly 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.club/wix?keyword=naa+autograph+songs++teluguwap.+net
    • http://gikugukem.cobbosseeconteesnowmobileclub.com/uploads/1/3/0/9/130969521/6c423cf50a18a.pdf
    • http://files.rjbcrafting.com/uploads/1/3/1/6/131637108/tufif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/1decf9_b3c696fd261347ab9c23bbe306eb63ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_c02035af460e4bfc92c6e51eb577c4a0.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_9432b0b49d99400289df644dd85dea81.pdf
    • https://static.usrfiles.com/ugd/b914b5_ba9e18c8670f4c7788adb6e6dfcfbc26.pdf
    • https://static.usrfiles.com/ugd/d5d855_69c4b6a14ff7400da4b89d58b30461f2.pdf
    • https://static.usrfiles.com/ugd/f5892c_eca578c5d2414da3baa7817579fc04ed.pdf
    • https://static.usrfiles.com/ugd/6846fe_f33362d2736a4139b16fc69984c7c0b1.pdf
    • https://static.usrfiles.com/ugd/9b33c5_6280e42ae2394643a0342501c0db9d17.pdf
    • https://static.usrfiles.com/ugd/d3758e_57e34e425c394d5d90cb3634d2563b9c.pdf
    • https://static.usrfiles.com/ugd/d6b5da_ca903834666e4140b0decdf9be73d9c9.pdf
    • https://static.usrfiles.com/ugd/9c43ec_f05f205076ef47d58d674eed0ec389f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_2df67ebf33d145a4a7d7626fcc6d1c51.pdf
    • https://static.usrfiles.com/ugd/11276f_763a62fb2639406b94a4a029a62985c5.pdf
    • https://static.usrfiles.com/ugd/6cabbb_6285b8426dcc460c8c426f81033f6a08.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_off00007797.bin
10a1d887ce7e9f7b2e747e1c202ed8509a35709fb6d8f1538c728c57653e0fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7797 5008 bytes
font_01_sfnt_off000088b1.bin
0ab135dca3048107b44e3da2ff7b7765719284e1744caba500e7fb18e14a128b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88B1 11512 bytes
font_02_sfnt_off0000ae50.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 4324 bytes

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