Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd524b4b48b4aec…

MALICIOUS

PDF

57.1 KB Created: 2020-08-11 05:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4996e2a8eb1fe1bcf7be61ed4d9df49 SHA-1: 1a71511f4eecd17ffaa2774ce36354482e45806b SHA-256: acd524b4b48b4aecb5ac84389fe002593c01604b8ed70720b314ce954b396702
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely for SEO manipulation or to host further malicious content. The ML classifier strongly indicated maliciousness.

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=probability+measure+theory+pdf
    • http://junulibi.madislandlibrary.org/uploads/1/3/1/8/131871921/6741851.pdf
    • http://files.averagejoesraam.com/uploads/1/3/0/7/130739062/1387123.pdf
    • http://files.inkandoakdesignco.com/uploads/1/3/0/8/130814120/644b8e229a.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/tolunefitinudulodewi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9354/files/23100459489.pdf
    • https://cdn.shopify.com/s/files/1/0433/3977/6159/files/71303912795.pdf
    • https://cdn.shopify.com/s/files/1/0430/7012/8277/files/22325971810.pdf
    • https://cdn.shopify.com/s/files/1/0434/7920/4006/files/acromegalia_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/39072894653.pdf
    • https://cdn.shopify.com/s/files/1/0435/5630/7107/files/dipole_antenna_theory.pdf
    • https://cdn.shopify.com/s/files/1/0433/5111/3887/files/gitumikogopab.pdf
    • https://cdn.shopify.com/s/files/1/0438/1445/3410/files/85984840983.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/51447992266.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0343/files/voganusifositefer.pdf
    • https://cdn.shopify.com/s/files/1/0435/1829/6228/files/vaxupepo.pdf
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/presto_electric_griddle_manual.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_off00008629.bin
f5d49e17bdf9a21142e9e5ad0b7a5311c895e05165f51a1929d934b7bc9fd312		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8629 5524 bytes
font_01_sfnt_off000098c8.bin
50e1f394dce0f46c4edb5ed47f4d6aa4e78c1c519fec8b4b0358470f7d92877b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C8 11384 bytes
font_02_sfnt_off0000bf35.bin
67ccb6955cdb2549793dd7fea65475ce5bc4470101d340280bca2017740d1b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF35 16788 bytes

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