Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc2755bbc9e3667…

MALICIOUS

PDF

65.9 KB Created: 2020-09-17 20:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154b15c2f7e6da638c035785ea0b04f5 SHA-1: de2b26df8e0b33ea334cd7b2229c019d4c115c6f SHA-256: 2fc2755bbc9e3667a4a78bf2429de06c6c321d8b04a119b09a933aada45713fc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.me, disguised as answers to a chemistry worksheet. The PDF also features a link farm, indicating a potential SEO poisoning or traffic generation scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it 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.me/wix?keyword=safety+in+the+chemistry+laboratory+worksheet+answers
    • http://sajes.sociedadlucasrd.org/uploads/1/3/1/6/131637136/rozezoju-dibonekefonew-poxafugorarogo.pdf
    • http://binalom.vinoetamicis.com/uploads/1/3/1/4/131406821/1425fc6c8d4.pdf
    • http://tapowit.24sevenjewellers.com/uploads/1/3/0/8/130814058/23abd141835a0f4.pdf
    • http://sakegaxi.auburnhighfootball.com/uploads/1/3/1/4/131482995/155762.pdf
    • http://files.yenbai.life/uploads/1/3/0/7/130739340/depuxewodirekabamir.pdf
    • http://files.carolinamunozparra.com/uploads/1/3/1/8/131856173/34d2f38d451.pdf
    • https://d3e839a4-3385-4007-8db5-7b36d0af9b41.filesusr.com/ugd/99965f_3bd81b21948b4c8fbdb7362bb0f0692f.pdf?index=true
    • https://0e140c65-19ca-4ac3-b8ef-b3d1fcdea467.filesusr.com/ugd/3f0e57_9a4658bde652447c8c7dd62234bc6e3e.pdf?index=true
    • https://c70d9cb5-5ee0-4055-a24e-c1520b9c6ae8.filesusr.com/ugd/a91264_d0823744e4784bc0b999e9099f4b47d2.pdf?index=true
    • https://ce0a350e-2ac9-4bc6-8f64-643ab1ff3f15.filesusr.com/ugd/77941b_6ad0824c690845f4a0a237d763f0e4ee.pdf?index=true
    • https://9ab944d5-d5c7-4318-9431-146bb98118ee.filesusr.com/ugd/decf6f_796073112b3d486bad2a2c8636d26978.pdf?index=true
    • https://dd8faa2d-22d2-426d-a350-668932e7aa5a.filesusr.com/ugd/11b39a_313b8567293846769fdce5f3140540e6.pdf?index=true
    • https://779d38ce-2291-4fe8-9a0f-ebaa111058b5.filesusr.com/ugd/8b2c09_c1b8ff7f0842449d8d275983acf5f2a6.pdf?index=true
    • https://74fc0767-419f-43d2-bdcc-1038f3417f5d.filesusr.com/ugd/89064d_b841c114afda449da180999e59824cd9.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b89d.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB89D 2828 bytes
font_01_sfnt_off0000c297.bin
c55bbeb67ec879f2551119cc59ff4d2e2d670027ed76ff676e258162b3d2569b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 5624 bytes
font_02_sfnt_off0000d5a6.bin
8ef353c191fbb2b34f990b3e165ecb3450ffa1968ac38c3627dc1c37f85edc5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 9900 bytes

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