Malicious PDF — malware analysis report

Static analysis result for SHA-256 00128856c40439ac…

MALICIOUS

PDF

42.2 KB Created: 2020-08-08 13:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afbf025232b2b2fd8a552e2b070b7e51 SHA-1: d31fbbf11bf72445a9790ebf54eadbfd63bf5d2e SHA-256: 00128856c40439ac83ab18a63b834b2d7fd4e388eabee838ff90d0245d26c75f
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, functioning as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=alcoholismo+en+adolescentes+en+bolivia+pdf', is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains a mix of text and what appears to be encoded data, further suggesting a malicious intent to obscure its true purpose.

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/pify?keyword=alcoholismo+en+adolescentes+en+bolivia+pdf
    • http://files.paqu.org/uploads/1/3/1/8/131871894/vibofukupu_ruzererijolibij.pdf
    • http://files.myerk.org/uploads/1/3/0/9/130969889/debuvinoxod_nekota_lumeka.pdf
    • http://files.shoggothkinetics.com/uploads/1/3/1/6/131636828/dabexazaxagise.pdf
    • http://files.enginators.com/uploads/1/3/1/8/131856108/2619030.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/39782115761.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/1999/files/37929386012.pdf
    • https://cdn.shopify.com/s/files/1/0436/1594/4867/files/canon_in_d_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/2106/5640/files/broiler_production_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/3164/2780/files/tovigufevefijisopikubez.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/alphabet_phontique.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/first_ten_amendments.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/feteg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/loribumak.pdf
    • https://cdn.shopify.com/s/files/1/0437/2276/8535/files/can_t_hurt_me_david_goggins_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/nubikonunuxavexoxuwitoro.pdf
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/xaganawixugilesej.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_off00006261.bin
8b8b27db21ef0067cecf9806c133fb9f2a753eb4db649a71471b7813298406cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6261 5488 bytes
font_01_sfnt_off000074ec.bin
e23e1f9fde87c6cc91cd11b7b05a503123f4225086603d1a71f1f37bad5a77dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74EC 11376 bytes

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