Malicious PDF — malware analysis report

Static analysis result for SHA-256 4325015a465be108…

MALICIOUS

PDF

66.6 KB Created: 2020-08-21 05:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5d70b5f5ab3ef27e104f7fc9de24975 SHA-1: a708a175fe6c66c6680793ef156d4ade9b0a7bbd SHA-256: 4325015a465be108be33a95e6721124e632cca80b4d5cc22c544ed5cbc1053dc
92 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=everyone+can+create+teacher+guide'. The document body, though heavily obfuscated, contains text fragments that suggest a 'teacher guide' lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=everyone+can+create+teacher+guide
    • http://fokal.ignitethejoy.org/uploads/1/3/1/1/131164460/televalow_dubef_wabupufidujo_sexinogumopajiw.pdf
    • http://files.debbieloganmft.com/uploads/1/3/1/4/131453133/b6abc86ba4a8c80.pdf
    • https://cdn.shopify.com/s/files/1/0428/8200/7199/files/sofikorebisipoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/eitim_bir_sen_aday_retmen_kitab_6_bask.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0496/files/2004_chevy_avalanche_z71_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/31835982072.pdf
    • https://cdn.shopify.com/s/files/1/0435/9582/5320/files/google_android_developer_documentation.pdf
    • https://cdn.shopify.com/s/files/1/0434/1124/3162/files/24966494386.pdf
    • https://cdn.shopify.com/s/files/1/0438/5941/1094/files/52061719510.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c989.bin
48ef774e199567e182a74327305aa4eaf25f554fe685ca852d816229da36a001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC989 5112 bytes
font_01_sfnt_off0000daec.bin
15f82d281d9b0a4fbb436f48c3d0328faaeab2bccdd795a1125607e358f66c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 10272 bytes

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