Malicious PDF — malware analysis report

Static analysis result for SHA-256 87427e569acc00d0…

MALICIOUS

PDF

54.8 KB Created: 2020-08-16 02:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3f53d48dbf5aa7a7731d771b4e3e748 SHA-1: 090c8ff043189ef5a07002f81537e32d154e6726 SHA-256: 87427e569acc00d03d5b949d2992d9bc6b10b46619aed5173755a16cc2940b7b
162 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, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wb?keyword=autodesk%20fusion%20360%20black%20book%20pdf'. The presence of a 'download button' lure further supports a malicious intent to redirect users. No scripts were extracted, but the document structure and link farm indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/wb?keyword=autodesk%20fusion%20360%20black%20book%20pdf
    • http://files.brooksidepathfinder.com/uploads/1/3/0/9/130969146/sazuxa.pdf
    • http://files.insonify.com/uploads/1/3/1/8/131857758/zamoxizunezalix.pdf
    • http://sukikos.walking-in-their-shoes.com/uploads/1/3/1/4/131406062/1981520.pdf
    • http://dowevomi.bnsfrr.net/uploads/1/3/0/9/130969061/xuxabubawej-sitopopat.pdf
    • http://files.conwayfeedandgarden.com/uploads/1/3/1/4/131438844/kikesemijowirin_furilumofos_xuxazutas_fozural.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wiwatubaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1747/8044/files/92782387411.pdf
    • https://cdn.shopify.com/s/files/1/0437/4259/3189/files/wurogopunujurobab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6497/files/committee_on_publication_ethics.pdf
    • https://cdn.shopify.com/s/files/1/0443/8884/3686/files/react_link_component.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4326/files/romawutiwidedid.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6139/files/55734576544.pdf
    • https://cdn.shopify.com/s/files/1/0429/9476/1877/files/jarija.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/gubigodiwem.pdf
    • https://cdn.shopify.com/s/files/1/0433/3325/5323/files/kadogemiratefirewa.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_off00009651.bin
4dae0a1a71eab7341dacd9272242f177d7154a60996ef49a36cddcf37808c256		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9651 5708 bytes
font_01_sfnt_off0000a9be.bin
c7ae2cc1a049b1dcacab21806245a6ca69d805256bfda66884a6ae768149dcb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BE 10716 bytes

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