Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c47ed04897322b4…

MALICIOUS

PDF

37.4 KB Created: 2020-09-08 13:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0376fcd8bd05302adb3ce57f0a70c1f3 SHA-1: b8285bc962250d706874a79eb1c93c02c7cc8449 SHA-256: 0c47ed04897322b46cd53bec97e5d2bbf882772862284f0cb91e5bfd38e69555
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 one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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.link/wix?keyword=android+17+phy
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/2074c9_9129238251c340d99d7277b5a3a5802b.pdf
    • https://static.usrfiles.com/ugd/79cb75_94a0a3ea3afd4fed9dfd06dbf01b8cc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_46201d8eba5c486faf7cc6226747510c.pdf
    • https://static.usrfiles.com/ugd/b11f6d_0fe719db5a354527af6164a47a1de54d.pdf
    • https://static.usrfiles.com/ugd/32acb1_28c54e9980fe4dc9a0b37af37d70bc26.pdf
    • https://static.usrfiles.com/ugd/3c9ac1_4d84152dadfa4ab7abf8a864fb2ad466.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/vemaposuvudajab.pdf
    • https://cdn.shopify.com/s/files/1/0431/3228/9175/files/tisoxiwolizivogudipeti.pdf
    • https://static.usrfiles.com/ugd/4dd980_97705b145aa644a984b4a7ce96672374.pdf
    • https://static.usrfiles.com/ugd/cc1a03_49c94c2f89c34999a6fa5e977805fcf2.pdf
    • https://static.usrfiles.com/ugd/b8c837_d48170fc2f3d4ee7b1f0ec795bda5ad2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005556.bin
905a53b4845933125062d52888de7be860367516de4ca5dcdcef963737435a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5556 4848 bytes
font_01_sfnt_off000065e1.bin
7924bf3c16bca04ce4a8a0899d150d54f82eed47cfd4fc73e585fb997bb69a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E1 10428 bytes

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