Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce3d9481c44513e…

MALICIOUS

PDF

53.2 KB Created: 2020-08-19 15:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43b58240e63e8926344495d553fe45c4 SHA-1: a0d7a662b6817fabc8b50b484082f7ae8bd38c32 SHA-256: 5ce3d9481c44513e48f6fdea61e58cf6393419ad96d1e0e6792da296aeeb7aa7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector at `https://ttraff.ru/pify?keyword=4+congruence+and+similarity+worksheet`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure under the guise of academic material. The ML classifier strongly supports the malicious verdict.

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=4+congruence+and+similarity+worksheet
    • http://files.buildingbetterbonds.com/uploads/1/3/0/8/130874529/9291668.pdf
    • http://vexarej.mairiwilson.com/uploads/1/3/0/9/130969036/petubif.pdf
    • http://files.natural--living.com/uploads/1/3/2/7/132710601/7720991.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7554/3964/files/bsc_3rd_year_maths_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/vuzedugoveletum.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2178/files/metijojatumoxexa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6104/3605/files/tawasaxuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/chasers_of_the_light_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/5666/7551/files/fafel.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8008/files/74527202210.pdf
    • https://cdn.shopify.com/s/files/1/0430/2834/9085/files/38397015531.pdf
    • https://cdn.shopify.com/s/files/1/0465/1696/1430/files/35046198037.pdf
    • https://cdn.shopify.com/s/files/1/0433/8538/9206/files/caracteristicas_psicologicas_del_adulto_mayor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/33740812669.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d0e.bin
3ac5c1cb604c3383ae57b89e076c5fcb4970c5f2fa696a5abd8f35c0b363c26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0E 5604 bytes
font_01_sfnt_off00009000.bin
cf8ad3aed2b138e6f83440f6d264bba632f6b8dbcefd8a9dcc76bfc081f53268		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9000 10052 bytes
font_02_sfnt_off0000b268.bin
24c5c481937acf4f4841e6563a6d7a18cfdb810806c94b09ac0ff4033348c1e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 16072 bytes

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