Malicious PDF — malware analysis report

Static analysis result for SHA-256 7570dc59b3836a67…

MALICIOUS

PDF

44.0 KB Created: 2020-10-05 22:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 799ee600c04f5035f65c8a74b41feacc SHA-1: efc391b6f0681c69698581623160598220621d9e SHA-256: 7570dc59b3836a670d52d98e43d5b956f020b39fba2e9043ff25ca0b461fa350
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/strik?keyword=asmedia+asm3142+driver'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The PDF also functions as a link farm, with numerous links to other PDFs hosted on disposable platforms, indicating a broader campaign for traffic generation or malware distribution.

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/strik?keyword=asmedia+asm3142+driver In PDF document text
    • https://site-1036830.mozfiles.com/files/1036830/boxofoteloranigokoxel.pdfIn PDF document text
    • https://site-1037887.mozfiles.com/files/1037887/93497837256.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/22589547492.pdfIn PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/natoxowuv.pdfIn PDF document text
    • http://wipil.piatocairns.com/uploads/1/3/0/8/130874277/9921697.pdfIn PDF document text
    • http://kimolawe.nursingandpublichealth.org/uploads/1/3/0/9/130969205/6113989.pdfIn PDF document text
    • http://files.totallysocialasd.com/uploads/1/3/0/9/130969265/zijafusolud-bijaloxizidomaz.pdfIn PDF document text
    • http://files.jenniferspianostudio.net/uploads/1/3/0/9/130969353/15eb233770.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f2e07adb-8ef6-422c-a749-5ecc3eddaa5d/54431909577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/675728ae-6056-4ebc-b93b-2a1979c27195/mipozufedibus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c60a56-240b-4ea4-8963-763571b5c1c0/wotafalemovuleta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdde17e3-600a-454b-ad56-b9ebc5255707/61926735959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3718/7493/files/50421667765.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/2756/3164/files/physical_therapy_abbreviation_spc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/0214/6212/files/the_silver_eyes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F48 4916 bytes
SHA-256: 978533883e46421cbbd6a0e957224b0eb81b94dd5e888da2333ff780d19ccd5f
font_01_sfnt_off00006ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFB 10828 bytes
SHA-256: 6538d78fdb806cb9cda9a78eda6a8e1e5cff732f44997fca29687fc7acf636a4
font_02_sfnt_off000094fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94FB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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