Malicious PDF — malware analysis report

Static analysis result for SHA-256 77402c4a20157868…

MALICIOUS

PDF

53.6 KB Created: 2020-07-25 14:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5d24e1b51bc4c9554779e70966a961 SHA-1: b84f74338a3cdacaa4e6ecc6570fc1c4e5e13305 SHA-256: 77402c4a2015786852851c5d2134c75984b2d7ee4fb27ef7e7be3c84f4c44e1c
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a link farm, with numerous external PDF links hosted on various domains. The document body, though partially corrupted, suggests a lure related to 'Credo mobile contract buyout form', likely intended to trick users into clicking the malicious link. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly indicate a phishing or malware distribution attempt.

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=credo+mobile+contract+buyout+form
    • http://files.cvropeandgear.com/uploads/1/3/1/8/131871685/64d8212f7b9.pdf
    • http://files.salvoselfdefense.com/uploads/1/3/1/1/131163723/5960249.pdf
    • http://files.whlandscape.co.uk/uploads/1/3/1/0/131070165/lefix.pdf
    • http://files.troubadourtheatrecollective.com/uploads/1/3/1/3/131398517/gineregeb_wosoxofij.pdf
    • http://files.kansasturfgrassfoundation.com/uploads/1/3/2/3/132303382/kisut_lodut_jedoku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/15969501815.pdf
    • https://cdn.shopify.com/s/files/1/0432/1761/7057/files/24750538138.pdf
    • https://cdn.shopify.com/s/files/1/0432/6991/4782/files/80008677525.pdf
    • https://cdn.shopify.com/s/files/1/0433/5271/9515/files/kujatirubelugimiriruxon.pdf
    • https://cdn.shopify.com/s/files/1/0438/1271/6701/files/kusagebakubuzigipi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/keferavodaram.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/57673253570.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tukesameb.pdf
    • https://cdn.shopify.com/s/files/1/0435/9539/9325/files/zasafuputasuderokarut.pdf
    • https://cdn.shopify.com/s/files/1/0432/8947/7278/files/muwobomatexamuvumanekujek.pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/zilofewerudinezotaro.pdf
    • https://cdn.shopify.com/s/files/1/0435/3199/3242/files/47203228740.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3284/files/82845837469.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/dutosivawezejedo.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_off00009430.bin
1e09132670d819d78aef817d214e0ebfa9dedc4e1746a92177ba576399b46ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9430 5136 bytes
font_01_sfnt_off0000a591.bin
d13451ae29be3bb236d8cef619f7bbdfe7e444d681b254f09b8c85704f87db77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA591 10320 bytes

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