Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d82a90372a6e13b…

MALICIOUS

PDF

42.8 KB Created: 2020-08-02 04:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 404d47bea1d52dca98279e1a73a93523 SHA-1: eb4df74b03c673d17e6d07ed5ba5d17a7f4b025a SHA-256: 7d82a90372a6e13bba387ab661cd55a9da1a446cf1eddaa7b1613458341c816a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm or SEO spam campaign, aiming to drive traffic to malicious sites. No scripts were extracted, limiting the analysis of direct execution vectors.

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=leetcode+word+break
    • http://files.ballenislessgc.com/uploads/1/3/1/8/131858287/mumujikituxaxex-buletabilosugo-magujeze-zitizakenisok.pdf
    • http://files.msfoster.net/uploads/1/3/2/6/132681880/3223503.pdf
    • http://files.greaterheightsfellowship.org/uploads/1/3/2/6/132682585/vogufude.pdf
    • http://files.oakleystables.ca/uploads/1/3/0/7/130776166/8770535.pdf
    • http://files.bberidesserts.com/uploads/1/3/0/7/130775249/tiripapurop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7300/1877/files/74139266941.pdf
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/xikerorezenibifa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/95673904631.pdf
    • https://cdn.shopify.com/s/files/1/0440/9622/5432/files/xefuzanapoxorun.pdf
    • https://cdn.shopify.com/s/files/1/0432/1781/3661/files/55058822715.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5578033559.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9841/files/2264992200.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/96729161650.pdf
    • https://cdn.shopify.com/s/files/1/0437/2260/4695/files/kedimot.pdf
    • https://cdn.shopify.com/s/files/1/0432/4058/7431/files/30835368622.pdf
    • https://cdn.shopify.com/s/files/1/0437/8044/0215/files/losazononoxupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7122/6534/files/subaru_forester_2014_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/0948/1624/files/29939845323.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6491/files/molar.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_off00005f7f.bin
64ca7824b6ecb7c94c4401015c1aa632e0a5759c5d187752c0df66a4ae56eddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7F 4960 bytes
font_01_sfnt_off00007084.bin
17e1692418b18cc1052ba98d13302979c3d9f0ce7ed096903507801bad370e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7084 14660 bytes

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