Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f30134fbb5dbadd…

MALICIOUS

PDF

54.7 KB Created: 2020-08-12 20:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3bef229dc15c80ef57c163f223f8e60e SHA-1: 8dd0900f56e27612f37e4561aababf86fe015a78 SHA-256: 5f30134fbb5dbadd7784c0dfc43adf55801d5858cf344ad2c6748028486f34d6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is `https://ttraff.ru/pify?keyword=caso+clinico+de+cirrosis+hepatica+por+alcoholismo+pdf`, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting an attempt to disguise its malicious nature.

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=caso+clinico+de+cirrosis+hepatica+por+alcoholismo+pdf
    • http://files.balletwithmissrachel.com/uploads/1/3/0/9/130969573/856c84bf1ac3622.pdf
    • http://files.mrobrien.net/uploads/1/3/1/4/131482916/vakok.pdf
    • http://files.abijoes.co.uk/uploads/1/3/0/7/130739517/zoxajapujanu-maburodiluxexif.pdf
    • http://files.parkhillband.org/uploads/1/3/1/4/131406395/9243388.pdf
    • http://files.matterbyregina.com/uploads/1/3/1/3/131384636/xejogoketas_mimonasij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/word_whizzle_professions.pdf
    • https://cdn.shopify.com/s/files/1/0437/2617/6407/files/1st_year_mbbs_biochemistry_books.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/wobapekabaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/5632/3995/files/74851110870.pdf
    • https://cdn.shopify.com/s/files/1/0449/8548/3422/files/bidders_guide_nsw.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/pudomumojejewasuzogola.pdf
    • https://cdn.shopify.com/s/files/1/0435/5840/4245/files/20783844803.pdf
    • https://cdn.shopify.com/s/files/1/0431/9048/5150/files/76802896213.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/baxukatadatuwakajo.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_off000087a2.bin
c0c16b086f6d1ac8daf073e7e66e10dd99453e28be9fb4a24e7b265e9b9f5d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A2 5208 bytes
font_01_sfnt_off0000991c.bin
bb9b3cee3736d5eadde1fb9d0dcb7d8d37e46108e2d8457c0c4b6c91c53e656b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x991C 11268 bytes
font_02_sfnt_off0000bd73.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD73 4324 bytes

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