Malicious PDF — malware analysis report

Static analysis result for SHA-256 88673c05593357c6…

MALICIOUS

PDF

47.8 KB Created: 2020-09-02 11:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eebdae63552a4e9f6723ac3285271782 SHA-1: 1c5c79bb0ad81235e48a1175c85d618e8e5d9d1b SHA-256: 88673c05593357c67751ff39c22e2665f546e45dcd21d93c4f060006f5475f29
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as 'chemistry notes class 11 pdf free'. This link leads to a URL that is part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=chemistry+notes+class+11+pdf+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_fcbed99362e3420ea838c0c4bbed583e.pdf
    • https://static.usrfiles.com/ugd/6da380_5c4216a37c104a64bae9f9ee04d7be5a.pdf
    • https://static.usrfiles.com/ugd/2ca22b_357a38ce6c6d4cab80b1390882b88f9b.pdf
    • https://static.usrfiles.com/ugd/6908d7_adaf3fe9e9e34ef58c189fff79a5c2c1.pdf
    • https://static.usrfiles.com/ugd/79e5df_64d36f2455af482ab3972fd6faaf2553.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6175/files/stk_amplifier_circuits.pdf
    • https://cdn.shopify.com/s/files/1/0429/1290/7427/files/25975079308.pdf
    • https://cdn.shopify.com/s/files/1/0433/9967/6060/files/gobomidadazovipomowetav.pdf
    • https://cdn.shopify.com/s/files/1/0440/7640/0792/files/penelapifeseguzefepemi.pdf
    • https://static.usrfiles.com/ugd/e4a001_751a68e0b4fe4150a4de8c9c1426e71e.pdf
    • https://static.usrfiles.com/ugd/77eba6_657a074325d84788be546aa925c7a488.pdf
    • https://static.usrfiles.com/ugd/3be3a7_a250d46b4e9e4c6183cb0e15306d40b4.pdf
    • https://static.usrfiles.com/ugd/bf650e_0af07941e4744adb876b4843a09c5105.pdf
    • https://static.usrfiles.com/ugd/b8c837_45e9aadc4c434208a91637fa99cada77.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/toefl_ibt_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0429/6094/5305/files/tipos_de_balas_y_calibres.pdf
    • https://cdn.shopify.com/s/files/1/0437/6631/7205/files/kidodu.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_off00007411.bin
a22af7bb7710e8057f481f23663c806e2e85548b6fc6e6fba693acccf492b569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7411 5452 bytes
font_01_sfnt_off0000867b.bin
56de705d084e0a1640d48112f2a9a64def72f53a24019513e9c5d5c2b4efbb3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x867B 13736 bytes

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