Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4c4e292984a5ba…

MALICIOUS

PDF

40.9 KB Created: 2020-08-06 02:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e11d0531b0d7eb45fd9c9aa09ed02efb SHA-1: 71968826d86c2228cb64781f2733c2ba3540b27b SHA-256: 7a4c4e292984a5ba33d6c317a7d6a09b723b23968843c52ada7e90d298e48380
214 Risk Score

Malware Insights

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

This PDF document is designed to trick users into clicking a link by masquerading as a study guide. The embedded link redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document also contains a large number of external links, suggesting a link farm, and the ML classifier strongly flagged it as malicious. The document body itself is heavily obfuscated and contains the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=ceh+certified+ethical+hacker+study+guide+kimberly+graves+pdf
    • http://files.patradolk.com/uploads/1/3/1/4/131437423/8795140.pdf
    • http://kafef.altoimaging.com/uploads/1/3/0/7/130739024/30451.pdf
    • http://files.apartmentwasherdryer.com/uploads/1/3/1/4/131406827/6950515.pdf
    • http://files.backstagenb.com/uploads/1/3/0/8/130814535/6225992.pdf
    • http://files.wirralcpd.co.uk/uploads/1/3/2/6/132681823/gewir_fuvisobob_vewugejevukid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/30489859788.pdf
    • https://cdn.shopify.com/s/files/1/0433/7755/7660/files/88345884417.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/bubavubeteragiwodal.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0434/1897/6408/files/rise_of_the_tomb_raider_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/laundry_shop_business_plan_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0435/7036/4571/files/73430256557.pdf
    • https://cdn.shopify.com/s/files/1/0440/8918/0310/files/windows_7_telemetry_updates.pdf
    • https://cdn.shopify.com/s/files/1/0437/0300/9430/files/50731360276.pdf
    • https://cdn.shopify.com/s/files/1/0431/2173/7882/files/tonapaxutu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7183/9135/files/39289420812.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f17.bin
e69eee8d29df7739ca650bc36539ae1b2084d71a55916ba0894438ea39eb7244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F17 5840 bytes
font_01_sfnt_off000072d6.bin
b77cb97f86a4e86a76c02014aee0ba0b52cebd534ac4faa799194cb38567effa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D6 10404 bytes

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