Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f085855f9f686cf…

MALICIOUS

PDF

64.4 KB Created: 2020-08-31 02:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32632bcc523608896820b55e147696f1 SHA-1: d5d57d67bf6d42d9998d0465023c3f158489bac0 SHA-256: 7f085855f9f686cf0f081d1c0a42527da551846d0a0ee3eaae71735378c213c4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to manipulate search engine results or direct users to potentially harmful sites. No scripts were extracted, but the presence of numerous external links suggests a phishing or SEO spam campaign.

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/wix?keyword=digimon+cyber+sleuth+farm+expansion
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/9d869b_c52e57c8edab427291fc10b7e588f64a.pdf
    • https://static.usrfiles.com/ugd/111c46_90bc307cc0d24f4cb2f87024dff5edc0.pdf
    • https://static.usrfiles.com/ugd/d2751c_6dcd23cce6ab468e8b4b11bd7f379813.pdf
    • https://static.usrfiles.com/ugd/3ceeb9_3c57f5f569b94c209933b46477c032a5.pdf
    • https://static.usrfiles.com/ugd/a4e402_66cad0a1cbf441a5a72d18505f45f45c.pdf
    • https://static.usrfiles.com/ugd/15cd4d_17cf253fa92c4abf973af8d77fc93faf.pdf
    • https://static.usrfiles.com/ugd/c0b427_3816b80e1edf422d974e6cd47c95925d.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_02840dec8fb34c788bf68f5e7f944e2e.pdf
    • https://static.usrfiles.com/ugd/7041e4_93119b2959754b98808832c13aa12161.pdf
    • https://static.usrfiles.com/ugd/fac845_52c7e1dba3ae44e08dc7a2481d0656ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6c43a1de9d949f5ad10a1b366588b14.pdf
    • https://static.usrfiles.com/ugd/3826db_57f14ca9780646718579c9150714dbaf.pdf
    • https://static.usrfiles.com/ugd/b8c837_a50be68bc346417ca75718a38f8bd66e.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_off00009db0.bin
c418651f495ac91d4867da9cc15f73df516b5cba0f9dec9c9ab3525f19e6160d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB0 9420 bytes
font_01_sfnt_off0000bcb1.bin
5a38692d7f06b89a8da4c5fdc0dfb00fb3759cac3a70aea1c436622c19d44ca7
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB1 5736 bytes
font_02_sfnt_off0000d023.bin
8e8252173abb2d341874b7ad5415842f87941ef62800e2a5526214972394abf7
pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 10556 bytes