Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d992a4d2c19641…

MALICIOUS

PDF

44.9 KB Created: 2020-10-12 04:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a635431d1a9c6c56172ee61ebf683493 SHA-1: df881acd0a74174d43b64ba164a170420ab3c031 SHA-256: 40d992a4d2c19641a890725ab9363f590f62d38fb9b21ee1d95e5e8c0ac84068
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector pointing to 'https://cctraff.ru/pify?keyword=my+school+life+essay+for+class+4'. The document body, though heavily obfuscated, contains text related to an essay and the malicious URL, suggesting a phishing or malware delivery attempt. The presence of numerous external PDF links, many hosted on disposable domains, further indicates a link farm designed to distribute malicious content.

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=my+school+life+essay+for+class+4 In PDF document text
    • http://losexi.intricatetaste.com/uploads/1/3/0/8/130814729/270214f27.pdfIn PDF document text
    • http://bazapoz.madisonstmedical.com/uploads/1/3/1/0/131070867/wegugaletife.pdfIn PDF document text
    • http://files.downbeachhockey.com/uploads/1/3/0/9/130969426/1479780.pdfIn PDF document text
    • http://tetober.thecoalitionict.org/uploads/1/3/1/6/131636665/tuvafoj.pdfIn PDF document text
    • http://files.verkoopjedak.nl/uploads/1/3/0/8/130814298/9664128.pdfIn PDF document text
    • http://files.ppischoolpics.com/uploads/1/3/2/8/132815752/631828.pdfIn PDF document text
    • http://files.vision-destinations.com/uploads/1/3/0/7/130775304/virajewimerif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b560b10-9620-4747-bc0c-240e9fe94e10/fobobagumejefal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81920380-a02b-43ab-981f-48e1ff924a36/50997750473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b869542c-2118-4b06-9fdd-92b271b3e128/wamajudowubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe56a7c0-5ae4-458b-96ff-2e90a247f562/25596253976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a7ea6f-00ec-4136-b0bc-d145ae2c6635/rokejop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeff16b5-a8a5-4225-8827-cd76b01d69b4/39026957956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e89741-a8d8-42d2-b0c3-ba1c85b0544a/18015221515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6141e775-9282-4331-ba13-30ec5b6fb1ed/subevodapox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524af4dc-01af-43cd-89af-0c39fcef031a/10366678829.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_off000072d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72D2 5164 bytes
SHA-256: ddc9ab79613f14982d18571840e8a72fb655c118fb5155e2b2225a3c7242a01d
font_01_sfnt_off0000846b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x846B 10024 bytes
SHA-256: 1f34b7fd1f772166e7bc4da2019e3ef056b2ec4a8669dcbbb8b5e5e0dea9d399

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