Malicious PDF — malware analysis report

Static analysis result for SHA-256 113c97149b3a82cf…

MALICIOUS

PDF

44.7 KB Created: 2020-09-01 00:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bd8804c22804b2b8bec133c0c47b1e6 SHA-1: 3693705c88d40d08749669526a70587e6b15680f SHA-256: 113c97149b3a82cfc562b08224e11ac512bff11a59aeaa47f2e0a2d0a5a3758b
162 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is a common tactic for phishing and malware distribution. The document body, though heavily obfuscated, contains the same lure text and URLs found in the heuristics, suggesting an attempt to trick users into clicking on malicious links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/wix?keyword=best+online+video+chat+app+for+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/a01749_fb78732cb55f4ce2bd22de5d8d82cbff.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2d3ad00f82e41b29ca32be804017d62.pdf
    • https://static.usrfiles.com/ugd/9e53d4_d0ec9807674545c58e0573800a0393cb.pdf
    • https://static.usrfiles.com/ugd/89064d_77312351947b4809b2ea26deb74cf344.pdf
    • https://static.usrfiles.com/ugd/fd3290_0cb9123759e14cd3991cb618b0d44527.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/xelelizafogibaga.pdf
    • https://static.usrfiles.com/ugd/79e5df_f7d18181933d4bc38b14c9a19351ecc4.pdf
    • https://static.usrfiles.com/ugd/9a242c_09922d479ffb4a6991169756c8d536e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c609c82d7a54b06a9d7d4c693bf26dc.pdf
    • https://static.usrfiles.com/ugd/3d0627_38bb9247aad24841bdd46ff28175675e.pdf
    • https://static.usrfiles.com/ugd/353d00_4d2c9207b6a24aeb869815c0bace82cb.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f8ae930d722489f853e281d9c3867c3.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_off00006364.bin
9b3fb28ec4faaa3548ff3212c5d0b7032e13ed14fa61498e5ed0da6efad6e024		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6364 5140 bytes
font_01_sfnt_off000074d7.bin
b8ac0cf05e940a0aafbcb1bdb48b4e0c5cefb0a641c45a996117a7176d8113f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D7 10292 bytes
font_02_sfnt_off0000981b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x981B 4324 bytes

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