Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b291e65bab4723…

MALICIOUS

PDF

51.3 KB Created: 2020-08-29 15:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc015d5c677c98bf4e5db3449a5b9419 SHA-1: 6254ef85b4d8a9d5689ef2384367a1240916b9a1 SHA-256: a0b291e65bab47236b2f4d2cb638706d01dc728d2212f172af02ce0a2ae08b46
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was identified as malicious due to its inclusion of a large number of external PDF links, a technique often used for SEO manipulation or to redirect users to malicious content. One of the embedded links, https://ttraff.ru/wix?keyword=nuevo+testamento+en+griego+interlineal+online, points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/wix?keyword=nuevo+testamento+en+griego+interlineal+online
    • https://static.usrfiles.com/ugd/b8c837_c9b8e2d6641343489e16d1e6645c7033.pdf
    • https://static.usrfiles.com/ugd/b8c837_82ffa41a2f0a4ea58ef08650f38e5c37.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d11b6247966490d9a33fece389ace91.pdf
    • https://static.usrfiles.com/ugd/b8c837_94a734d428014021b55e1f01f855b377.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ffffdde1c9e46d99e8b814fb6aa3193.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1f77c90893a4412aaa3473ad3b14f38.pdf
    • https://static.usrfiles.com/ugd/b8c837_b462ce94a9fc47b78bb74f37b72a051f.pdf
    • https://cdn.shopify.com/s/files/1/0448/1197/6855/files/conceptual_physics_12th.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/31604987781.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/sujofotorobuputefese.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7692/files/github_pages_template_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/naxajapibukijivadet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1348/0343/files/5350923530.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/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059e9.bin
8b511c58d3234fa9e6ad089c95d1dc2bd0b31f87be7a4d6a8849fccc4da5c7d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E9 2912 bytes
font_01_sfnt_off0000644e.bin
3bc8da1aa0030824a38a8694da7575f5cb4bc824a1b054da5fe9e7ac88d854ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644E 5032 bytes
font_02_sfnt_off00007557.bin
d750e08c92d48f03945619444812ca582d40ce7f820582ea9c9bc586a7215163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7557 1796 bytes
font_03_sfnt_off00007e4a.bin
1962933df92f798e836b4933be1ecd82dfa54df56465ce24de7e9c1d1308abb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4A 13772 bytes
font_04_sfnt_off0000a9e5.bin
d48b1233be254656687db77c8eae6ffcff4b7143dec01ce3151067ebe2f043ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E5 16196 bytes

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