Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9088183304008b…

MALICIOUS

PDF

41.9 KB Created: 2020-08-08 13:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d366e28fed79df3c37a10ee96a42166 SHA-1: f5f8c53f385034b41647eb201ec52f269660f6a9 SHA-256: 8e9088183304008b5393036764a51a7cf85a675df7d62d2ef784e34fff7cf71d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high density of external links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=bgp+protocol+rfc+pdf, which is likely used to direct users to malicious content or phishing sites. The presence of numerous links to Shopify-hosted PDFs suggests an attempt to leverage legitimate platforms for hosting malicious content or for SEO poisoning.

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=bgp+protocol+rfc+pdf
    • http://files.theflatspot.net/uploads/1/3/0/9/130969631/zapivozomeri_sipoxegibatu_nepupeno.pdf
    • http://jizizo.avecatering.com/uploads/1/3/0/8/130814017/5877721.pdf
    • http://files.fabiolapiedadmariaalicia.com/uploads/1/3/1/4/131453026/4b29766101db0f7.pdf
    • http://files.saberlightknights.com/uploads/1/3/1/4/131437379/779666b2a86.pdf
    • http://files.writingandrhetoricmke.com/uploads/1/3/1/8/131856852/muwuteresaniziligebe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/57982243014.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6802/files/mamotibizibexelijumux.pdf
    • https://cdn.shopify.com/s/files/1/0438/3526/1085/files/va_760_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/pevib.pdf
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/65360150881.pdf
    • https://cdn.shopify.com/s/files/1/0435/7432/9507/files/position_relative_css.pdf
    • https://cdn.shopify.com/s/files/1/0434/9421/1750/files/center_pivot_irrigation_systems.pdf
    • https://cdn.shopify.com/s/files/1/0428/6211/7023/files/jepavilurejuvukotalorij.pdf
    • https://cdn.shopify.com/s/files/1/0434/1363/5226/files/health_occupations_aptitude_examination.pdf
    • https://cdn.shopify.com/s/files/1/0438/1730/4226/files/spoken_english_practice_lessons.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_off000063a8.bin
c85d4cf4043e7d9989bdb3a14b1224118e1eeae4fa45437bc5289943193d6596		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A8 4984 bytes
font_01_sfnt_off000074b9.bin
f8358e9eba1402f594f46aba1ffc61a28392c752e0a426461fc2fd8d00858894		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B9 11904 bytes

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