Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4798fc4611fdfaf…

MALICIOUS

PDF

53.7 KB Created: 2020-07-30 20:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2afcd1d4ec9e7df354e7023bc097f496 SHA-1: 3f8cd48afe2c677346e709ca23749aaf56861bd2 SHA-256: a4798fc4611fdfaf3694a079e10ddfb5ca1c1b420be4dbfc8af565c5321de518
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links designed to create a link farm, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is ttraff.com, which is used to redirect users. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its intended content beyond the presence of links.

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=peter+pan+summary+pdf
    • http://files.concreteheritagemuseum.org/uploads/1/3/2/8/132814906/5227314.pdf
    • http://files.mx.autumntheodorephotography.com/uploads/1/3/0/9/130969012/wuxoxixem_zebini_xizejo_giwukeg.pdf
    • http://files.findtheyeti.com/uploads/1/3/1/4/131410545/tofosu.pdf
    • http://files.designbyllewelyn.com/uploads/1/3/1/6/131607310/be7c3aa365b6.pdf
    • http://files.tarltoncabinetshop.com/uploads/1/3/1/3/131398250/eb9f72.pdf
    • http://files.findtheyeti.com/uploads/1/3/1/4/131410545/tofosu.pd
    • https://cdn.shopify.com/s/files/1/0440/4733/5574/files/78026495057.pdf
    • https://cdn.shopify.com/s/files/1/0429/0769/7305/files/dedebolivoruke.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/vufowufinagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0433/4367/5560/files/rejudatezibomu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6488/5397/files/gowewafokitobuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/8059/8172/files/9718712721.pdf
    • https://cdn.shopify.com/s/files/1/0438/3070/6333/files/95543568556.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tokisesuzarutaxiwiru.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/42626986995.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/56809568314.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2749/files/dunejugoretar.pdf
    • https://cdn.shopify.com/s/files/1/0436/9586/6010/files/93978742493.pdf
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/junokezojumoresimekoxux.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_off0000857d.bin
8f72e3ea29ab628f930eab46e85a416f40edcfe701d0d3a2cf677334e873674e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x857D 4980 bytes
font_01_sfnt_off00009646.bin
f23e6601f8f76cc5d35681382c98386ba2d2db00bc39a56e0594377e9b419a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9646 16656 bytes

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