Malicious PDF — malware analysis report

Static analysis result for SHA-256 19405e8554284957…

MALICIOUS

PDF

43.2 KB Created: 2020-08-08 17:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7a4e3f10b37a65b312e4b94497117bd SHA-1: 85564ff065502831df3c334b505f962e8c2211f7 SHA-256: 19405e8554284957265954b36764921445a2450255db4362a70ee04e8cfbec19
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=lexical+semantics+sense+relations+pdf', is identified as a malicious redirector. This suggests the document is designed to lead users to potentially harmful content through a link farm, likely as part of a phishing or SEO poisoning campaign. No scripts were extracted, but the presence of the malicious redirector and the link farm strongly indicate malicious intent.

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.cc/pify?keyword=lexical+semantics+sense+relations+pdf
    • http://files.stefanschwarzkopf.com/uploads/1/3/2/3/132303388/fff67.pdf
    • http://files.fittingroomligonier.com/uploads/1/3/0/8/130814672/sodumavasoso_sugenufefigu_tinivotosuna_sezomojodupebe.pdf
    • http://files.homecade.com/uploads/1/3/1/3/131379689/tokeneriwokolagavip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/smart_home_ecosystems_the_internet_of_things.pdf
    • https://cdn.shopify.com/s/files/1/0444/4625/3222/files/java_book_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/1188832559.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/26523716859.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/tipejotijotojarugotenota.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/40511811342.pdf
    • https://cdn.shopify.com/s/files/1/0436/5441/4494/files/nofeme.pdf
    • https://cdn.shopify.com/s/files/1/0432/4219/3058/files/19948489979.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/muxegusovijole.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89647405972.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/fomukogupe.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_off00006aa5.bin
85ad1b5ba6cda578de63de67fefc679f58855cf7df98b9ddc32bef955336acf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA5 5312 bytes
font_01_sfnt_off00007ca6.bin
675a760b330e46407aaa516a8941537dd46c5b0fef6c441c3627bb128695eb35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA6 10468 bytes

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