Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b061521e84fffe…

MALICIOUS

PDF

48.0 KB Created: 2020-08-01 06:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71a681a1a3f843f12fc47f6c00cfc5ff SHA-1: 32fbcc898b913fa968dd7729181137b75c58fee5 SHA-256: 01b061521e84fffe90017b0c539ec9c5cb2638295d57f7d3ce89db90787d9d12
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though obfuscated, contains a URL that likely serves as the initial lure. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests a link farm or redirection tactic to distribute further payloads.

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.cc/pify?keyword=copy+assignment+operator+c%252B%252B
    • http://files.lhsphotographyanddesign.com/uploads/1/3/0/8/130813827/masapolonirebadu.pdf
    • http://files.bigpinelodgebooks.com/uploads/1/3/1/3/131380107/8703212.pdf
    • http://files.akamitzi.com/uploads/1/3/1/8/131857270/27d178fa00ec0.pdf
    • http://files.astonishingstudios.net/uploads/1/3/1/3/131379730/gunoziraxofusosujel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/87994406858.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9654/files/13186010257.pdf
    • https://cdn.shopify.com/s/files/1/0437/6782/4533/files/42046797356.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/zinigupizomon.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/60012225176.pdf
    • https://cdn.shopify.com/s/files/1/0433/5904/3749/files/bedekotupagokemusobij.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9074/files/nelasukeginomazovogiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/noxunevegup.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/fiwujidurasotez.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/zepuxakidumanadu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nalajenoderemomepofelefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1097/3083/files/vagufo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/refitapobofubogiwimubik.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/69215886561.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_off000072cc.bin
446ede3b81b3c594d835ebf079e86810a97f1f63382c0b33c428fbad5c097be7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CC 5228 bytes
font_01_sfnt_off0000848a.bin
38ee2186e4957185a59334489a99c281e7bb8bfa18ccfd2d84ed89ff845606c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848A 14976 bytes

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