Malicious PDF — malware analysis report

Static analysis result for SHA-256 741b2accfa5b8e1b…

MALICIOUS

PDF

44.8 KB Created: 2020-10-10 20:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 211f1de9d0b0d7ac67be5b297e0ffe4d SHA-1: f04ae74aa6aad973a9f754a6b05b3273b8f3a965 SHA-256: 741b2accfa5b8e1be6696b1b69b33f4ebed48d0638bda6a0fef4feac9ef254c9
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several heuristics indicating a link farm and malicious redirector usage. One URL, https://cctraff.ru/pify?keyword=electronic+basketball+game+handheld, is explicitly flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text related to the embedded URL's keyword, suggesting a lure.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/pify?keyword=electronic+basketball+game+handheld In PDF document text
    • http://files.danlubakery.com/uploads/1/3/0/7/130775603/6082308.pdfIn PDF document text
    • http://files.concretejunglefarms.com.au/uploads/1/3/0/7/130776590/66d1ecfddc.pdfIn PDF document text
    • http://files.meredithbledsoephd.com/uploads/1/3/0/7/130774990/5970886.pdfIn PDF document text
    • http://sufemug.pinky-guerrero.com/uploads/1/3/0/7/130776769/dijuminu.pdfIn PDF document text
    • http://files.songmountainwushu.com/uploads/1/3/0/9/130969415/e1a5a11fbfb.pdfIn PDF document text
    • http://files.nature-recharge-botanicals.com/uploads/1/3/2/6/132683087/1950813.pdfIn PDF document text
    • http://files.trescare.com/uploads/1/3/0/7/130775932/8253128.pdfIn PDF document text
    • http://files.beckiehennessy.com/uploads/1/3/0/7/130740612/9489390.pdfIn PDF document text
    • http://files.laurapresley.net/uploads/1/3/1/6/131606348/8642092.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3967/7342/files/ancient_greece_laws.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8081/0136/files/taroxireder.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8978/3703/files/dexexawol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/9908/0854/files/powerhouse_candy_bar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0400/2210/files/gufelepujinabewuzenatowuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8882354-e460-4aa7-9b10-c44d2fe3b22d/52176362473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409aa412-2f5b-4351-ad00-a0e403bf4ebb/zagudofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/187dbb99-4092-4767-acdc-b0b67c886919/bapusemama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a005da-d511-42ed-bd53-64e51b8e20b3/30193167320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2baab0a-f0cb-4b18-99bc-b22e8758483f/xupuvuba.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7058 5512 bytes
SHA-256: a160a0a02da7e9c18b00be04c8695f532b49707a6b7bde9a1f84d7af6d02de05
font_01_sfnt_off000082dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82DD 10168 bytes
SHA-256: f0877f21a53815d915ba425aa61d1dca1fbf4a65e5ce37d0cd5a899df08f23ae

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