Malicious PDF — malware analysis report

Static analysis result for SHA-256 9787f858a0cd3520…

MALICIOUS

PDF

56.2 KB Created: 2020-09-06 06:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e806553403af398ef874eec40dd1787e SHA-1: 0c1eed1df19f61b242939cd5d6b5ffb5773aa9d7 SHA-256: 9787f858a0cd3520997ee03c4a73e2e5255089ab262a15db18085137a092fce5
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.me/pify?keyword=install+jdk+android+studio+oracle', is designed to redirect users to potentially harmful content. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting a broad distribution or SEO manipulation tactic. The ML classifier strongly indicates 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.me/pify?keyword=install+jdk+android+studio+oracle
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/wastewater_treatment_plant_journal.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/kirerizomoxejaba.pdf
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/66057327861.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/jipidavimalefajo.pdf
    • https://cdn.shopify.com/s/files/1/0450/6904/1827/files/lawumeleguzanaxiloj.pdf
    • https://static.usrfiles.com/ugd/17159d_1171efd94de043998a349915a63674f8.pdf
    • https://static.usrfiles.com/ugd/de60da_941d4b9145b541fe9986391d6310b73d.pdf
    • https://static.usrfiles.com/ugd/38eac1_83e7a477059b491bb21ebe4650ebc062.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bc36a9f5104486ca7fc52d0f3f10884.pdf
    • https://static.usrfiles.com/ugd/5de1df_ee89f4bdbdc24a12a2ff5902bf126b49.pdf
    • https://static.usrfiles.com/ugd/229b11_6f5610ee8953413c93d39632dab4340e.pdf
    • https://static.usrfiles.com/ugd/55f640_81d33fe6672d474a943128ca71c5d7be.pdf
    • https://static.usrfiles.com/ugd/b8c837_55886708fb3b4cd68b1e5640a4c7babe.pdf
    • https://static.usrfiles.com/ugd/9cb927_55303ad083c04e1baa4c67db24f80579.pdf
    • https://cdn.shopify.com/s/files/1/0434/2284/3036/files/avancemos_4_cuaderno_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/89743185434.pdf
    • https://cdn.shopify.com/s/files/1/0430/2998/7489/files/momazadojuzafogug.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/
    • https://static.usrfiles.com/ugd/38eac1_83e7a4

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d8d.bin
e175d59ed46aecfec4d801d4798c4d77099407654a90f27859408031c0b9aa5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8D 5012 bytes
font_01_sfnt_off0000aead.bin
40329daa9ac6a5bb7fcbd16d9b7af31255613425ac870ebc2979a6740c9cf4a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAD 10684 bytes

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