Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85451601f38f7c8…

MALICIOUS

PDF

65.6 KB Created: 2020-08-22 05:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8190681f47d7cf0f1ea43c502e5b294 SHA-1: 71cdfa641fe1dca537b090572004530d600b05fb SHA-256: d85451601f38f7c8f758ac39095265a5d393c59108b288614529caea9ddbe327
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF was flagged as malicious due to a critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the suspicious redirector. This suggests the PDF's primary purpose is to lure users to a malicious site via the embedded link.

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.com/pify?keyword=game+dev+tycoon+2+guide
    • http://files.detroitbiblequizzing.org/uploads/1/3/0/7/130739379/familovi.pdf
    • http://files.7westproductions.com/uploads/1/3/1/3/131380616/6818143.pdf
    • http://tigaf.findingproofdawnsgenealogy.com/uploads/1/3/1/8/131871921/raxogoponakotob.pdf
    • https://cdn.shopify.com/s/files/1/0437/2532/4439/files/classical_electrodynamics_jackson_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/72465497873.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7885/files/52401881516.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3178/files/netomutike.pdf
    • https://cdn.shopify.com/s/files/1/0461/5054/9667/files/98987026292.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/gudij.pdf
    • https://cdn.shopify.com/s/files/1/0430/7006/2754/files/xiwujajowobewido.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/fikifivavumava.pdf
    • https://cdn.shopify.com/s/files/1/0430/7212/7125/files/uninstall_xbox_gaming_overlay.pdf
    • https://cdn.shopify.com/s/files/1/0440/7069/9160/files/86835234139.pdf
    • https://cdn.shopify.com/s/files/1/0430/4951/7205/files/fezexo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/57425360871.pdf
    • https://cdn.shopify.com/s/files/1/0428/5300/7526/files/kuwotoxamujuja.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a9ea.bin
434edab843206539e69e4d897f0aa76800a6bf5a9eac707a9ea508adda2b84ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EA 5160 bytes
font_01_sfnt_off0000bb7d.bin
611fa7e8a6be566003c72ab748378b9feac9d19676fee582caa01a2b9874a5a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7D 15208 bytes
font_02_sfnt_off0000eb01.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 4324 bytes

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