Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c27081090497806…

MALICIOUS

PDF

42.1 KB Created: 2020-10-04 11:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 591404af35c9dc22be58faa59e891f9b SHA-1: 7014a1704500957f1daa303396e5f86d2370625c SHA-256: 5c27081090497806a31d1a6f5ec85c0c6275d9b00984d2a35db66ac6adb43736
124 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is likely intended to lead the user to a phishing or malware download site. The embedded content, though heavily obfuscated, appears to contain the malicious URL. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection attack.

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 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://ttraff.club/pify?keyword=blue+october+full+albums In PDF document text
    • http://fafotigob.criticalblink.com/uploads/1/3/2/7/132741064/4104796.pdfIn PDF document text
    • http://lexurini.vinegardenmarket.com/uploads/1/3/0/7/130776492/82690e2f7.pdfIn PDF document text
    • http://files.jeffstreebyauthorizedsite.com/uploads/1/3/1/0/131070526/690f749.pdfIn PDF document text
    • http://jetunax.calaverasarts.org/uploads/1/3/2/7/132741100/3500105.pdfIn PDF document text
    • https://site-1042264.mozfiles.com/files/1042264/95658098576.pdfIn PDF document text
    • https://site-1039295.mozfiles.com/files/1039295/90033496203.pdfIn PDF document text
    • https://site-1036935.mozfiles.com/files/1036935/diritedevutovoval.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/1/0493/0682/8959/files/tafixaraka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/32015656398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/85541800797.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5853/0966/files/37180501013.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/6948/1636/files/89936297430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24cdb9f1-314f-49d9-a313-e2b57cdaffd6/semimozumipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d28108d-d006-49ea-9318-171dd148c21a/25221614662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58655dc7-ea7c-4cda-9ee7-cd6fd28b638c/bamapoxilebugiwab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97643949-73ca-46a0-89a0-009d8613ccac/53336261313.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_off000065ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65ED 5216 bytes
SHA-256: 5ca011395f64e3561a95ec3ce3e4da055b6599062145fc86874d14273c144154
font_01_sfnt_off00007794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7794 10528 bytes
SHA-256: add53731f6d06907137e99ac877a469741e64109594b0fa79628d3d9dda9e11d

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