Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8851d9cfaef748…

MALICIOUS

PDF

53.4 KB Created: 2020-08-10 07:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b94a4f1e8b44900434c2602d7f749957 SHA-1: c85af83fb92461804561cfa6241bccacfaf047cc SHA-256: ff8851d9cfaef7483960b71c6cfba52cad71b6a79c04f7e4e3b43d7bcbe27b2f
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector link, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=argumentative+essay+outline+high+school+pdf
    • http://files.ioscaid.com/uploads/1/3/1/3/131379085/6042070.pdf
    • http://files.babuni.ca/uploads/1/3/1/8/131872149/4784547.pdf
    • http://files.g2gdrivingacademy.com/uploads/1/3/1/4/131437318/9642682.pdf
    • http://tulipel.installatiebedrijf-altena.com/uploads/1/3/1/6/131636664/a426c2b64.pdf
    • http://files.shopscooponline.com/uploads/1/3/1/3/131378852/lufukemebavaxu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/55918094591.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/monthly_vehicle_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0436/2996/9561/files/robimasozuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/t25_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/0938/4343/files/25637043852.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9605/files/epson_workforce_ds510_color_document_scanner.pdf
    • https://cdn.shopify.com/s/files/1/0429/7952/4759/files/fefapigelof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6551/5933/files/alevines_tilapia_roja.pdf
    • https://cdn.shopify.com/s/files/1/0447/9628/0993/files/network_marketing_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/2008/2590/files/68774328805.pdf
    • https://cdn.shopify.com/s/files/1/0434/9453/9429/files/elementary_surveying_14th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/sigebis.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_off000091d9.bin
df2c042083428d609e0372ffa4b2f940cc9f2b0a2421b0de9e7ab1604d69db4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91D9 5720 bytes
font_01_sfnt_off0000a535.bin
89703562cfee649746f4443dcee4f17a5fa6c191d8a26cd93109c31d6d054107		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA535 10240 bytes

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