Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11816a0d255b632…

MALICIOUS

PDF

66.2 KB Created: 2020-08-30 03:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf45484d4753e3ef016573fcea07655a SHA-1: 20e11df4ec149b214448859b921fc80940894db9 SHA-256: e11816a0d255b632138b52fa0b8cf8b28ae6901ecd7f4de9f43e2955dccad60e
152 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs. A critical heuristic identified a PDF redirector link pointing to 'ttraff.ru', which is known malicious infrastructure. The document body, though heavily obfuscated, contains the same redirector URL and appears to be a lure related to 'the lottery shirley jackson worksheet answers'. The high ML score and the presence of a malicious redirector strongly suggest this PDF is designed to lead users to harmful content.

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.ru/wix?keyword=the+lottery+shirley+jackson+worksheet+answers
    • https://static.usrfiles.com/ugd/b8c837_ed6125991468494fadaf8b3c2ba5b7e3.pdf
    • https://static.usrfiles.com/ugd/7d1dc9_39c9bb8e79074b379d29a77b46bba38c.pdf
    • https://static.usrfiles.com/ugd/895bef_69624c39b1784fb0a265708f829fc658.pdf
    • https://static.usrfiles.com/ugd/b8c837_2734c83abdf44af1a55532e2184037fa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/xesepizarexonum.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4830/files/the_wolf_of_wall_street.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7110/files/bacterial_classification.pdf
    • https://cdn.shopify.com/s/files/1/0437/8319/2727/files/pusibuzonabonuduneguzov.pdf
    • https://cdn.shopify.com/s/files/1/0440/4035/6005/files/37826667743.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/buduje.pdf
    • https://cdn.shopify.com/s/files/1/0464/9756/2776/files/brazilian_portuguese_grammar_exercises.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bea812e58aa4682a145666f37f3d00f.pdf
    • https://static.usrfiles.com/ugd/b8c837_19d9407701564c2891419850f091e039.pdf
    • https://static.usrfiles.com/ugd/b8c837_20ef6ccba5964ecfb694e2da3c44c52b.pdf
    • https://static.usrfiles.com/ugd/0789d5_ce6b1ad351f446759f1bb0bb7245527f.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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ba5.bin
bcb20f81d3faa366a5f88d1e9024fb268a4bc2ab5f9d0ccd140861f2a6b93bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA5 3552 bytes
font_01_sfnt_off0000884d.bin
88c2c8d120ae6159c81de2baff186b9a9d729305e0cd920802b87a5e110f8682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x884D 5172 bytes
font_02_sfnt_off000099fd.bin
893626647e77416ac1119461dc93003995e44441879a3d41745cd49b63f413c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99FD 13364 bytes
font_03_sfnt_off0000c6ab.bin
59fab9109e1d857f3a3c0261ad3d99e80e07d95ca9c069a94f039be7edf44958		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AB 17008 bytes
font_04_sfnt_off0000df15.bin
da793f1d8d8c1e69a9e1a8dceefe0fcc553b552318ac3e53b0f102899ea6afc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 3120 bytes
font_05_sfnt_off0000ea7b.bin
c521f04259192be294b964d277e791edbade136c3abd3634166c38d4cfc68080		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 6332 bytes

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