Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da70a1b875bcaa1…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3767753438af591a9f61b558b3603971 SHA-1: 5a763a925197c8c049d03d31d26279a36e493fda SHA-256: 0da70a1b875bcaa1257e458bcb1fe78caa7053240bbbdd7ac80f617cdb3a898c
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet with answers, likely a lure to encourage clicks. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL supports this assessment.

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.com/wix?keyword=articles+worksheet+pdf+with+answers
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/e2f7e1_5965df035bc94e07b8d86a157af58283.pdf
    • https://static.usrfiles.com/ugd/b8c837_6eaa2cb787b24813958636a975cbcb37.pdf
    • https://static.usrfiles.com/ugd/b8c837_f167e14e2d9146d89997c6dec38086bc.pdf
    • https://static.usrfiles.com/ugd/5ecadc_d644b27792964dca92e43d9230dd6fad.pdf
    • https://static.usrfiles.com/ugd/32777b_8855985412894a9eb679c66fa52e59c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb29f418574e454f9bb737e69a85a542.pdf
    • https://static.usrfiles.com/ugd/a86d68_f8f5be90fcff4e369493dc5fd24b5408.pdf
    • https://static.usrfiles.com/ugd/345929_85e1aa9cf58c4a13923ae0cd9a0f1127.pdf
    • https://static.usrfiles.com/ugd/79cb75_04c2febd92a04413a481694241cebf4b.pdf
    • https://static.usrfiles.com/ugd/10e3af_0b37594c811d43139cb178d35a66a3a6.pdf
    • https://static.usrfiles.com/ugd/74a852_df0fde85ed3e4ef9962681ba9c8d07f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c89056227e6f45a3a5d8eed9a9e47951.pdf
    • https://static.usrfiles.com/ugd/225520_41bcb04098424840a998dc3d07b0fbf7.pdf
    • https://static.usrfiles.com/ugd/516574_c278c8fbd8e642f9ae3973341352bea9.pdf
    • https://static.usrfiles.com/ugd/f7fbc8_bd10cc1a59c7451ab284e88b8146ff89.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d4.bin
5d9466a0360cc291a2b7315ffafaeb80a146bfdd435d6fc002b6ad14f6293c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D4 5176 bytes
font_01_sfnt_off0000736b.bin
c2271b1f7cebda1938ce89ff74fc4ad34d789af671f3a4e3ebe8ad41a8bfd3fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736B 10632 bytes
font_02_sfnt_off0000978f.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x978F 4324 bytes

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