Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac17c6b81f6308e…

MALICIOUS

PDF

36.8 KB Created: 2020-08-30 22:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8683a8db486c6c22d46ca27530ea3fa SHA-1: b22e19749917aa6b7b07d705ada573a09f479159 SHA-256: 0ac17c6b81f6308e831fe9d10b7ab7e73bcdabcb8b7d0883aa95075a65e75dee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links, one of which points to a known malicious redirector. The document body, though partially corrupted, includes text suggesting it is meant to appear as instructions, likely a lure to trick users into visiting the malicious URL. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to malicious redirector infrastructure.

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=baxter+vial+mate+adaptor+instructions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/df4650_cf3350954d7e48a4876f89642d7a4b17.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8f0a6fa93dd4babb76a95e8490c82dd.pdf
    • https://static.usrfiles.com/ugd/36f25b_49d091ba9d004ef3b4b14928a30af4e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ab475b41a142b8b91bf48faf579473.pdf
    • https://static.usrfiles.com/ugd/8ab72e_1fe039afaf274aa2b01adcf69893349a.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_45ff7e0159d94a7b8e4589482db961ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d6f1bd433a140919c808262f51d2089.pdf
    • https://static.usrfiles.com/ugd/b8c837_96a059437a0649ac9aaf8f377b63c9d4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d928d30a28b4f8c87529791b03cfff4.pdf
    • https://static.usrfiles.com/ugd/8b4172_38eea6d62c4740de818714eda2080b27.pdf
    • https://static.usrfiles.com/ugd/3cb679_4053849e0a384edb90dae07f17b643b5.pdf
    • https://static.usrfiles.com/ugd/837d34_2f5e77fdf4ee496cbd8885b56ec5ba9e.pdf
    • https://static.usrfiles.com/ugd/7dd30d_dabd66922d0c49ccad77dc93d7c0bb30.pdf
    • https://static.usrfiles.com/ugd/3f80ec_5cd5304337f44631b805f6e7c9349e6f.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_off0000455e.bin
fc61b4b32d8f203e64945506e95fead00da0a99841d88f9d8fff15dbbbfd4045		 pdf-font-stream PDF embedded font (sfnt) at offset 0x455E 5276 bytes
font_01_sfnt_off0000573a.bin
de201bdb432a98efcbfabf938b388b524867f626b6a63ae22cb7f428bafe477d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x573A 9668 bytes
font_02_sfnt_off00007866.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7866 4324 bytes

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