Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad39f4de9e085354…

MALICIOUS

PDF

34.8 KB Created: 2020-10-29 22:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8746c91eff17e189d9228701a6c96a9c SHA-1: 3ce3281fb0b977e1025fd0e45cb6a75b59242206 SHA-256: ad39f4de9e085354033cb4c7be471dca491aabfa8efe2134d1f489a1e6bedbb3
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics, suggesting an attempt to direct users to potentially harmful content.

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 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.
  • 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.cc/123?keyword=suzuki+ltr+450+plastics In PDF document text
    • https://mogawurid.weebly.com/uploads/1/3/4/0/134042680/dutasoja_jilusudowufowub.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/8e9af831d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f91adeccf228.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/336f25e3-802c-44c3-bb0e-1ee68e27d2eb/17758902200.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0806/5191/files/dungeons_and_dragons_monster_manual_3.5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0168/2343/files/bp3-12_battery_ebay.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0254/3261/files/descriptive_essay_assignment.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7108/7007/files/eatwell_plate_vs_eatwell_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4456/8739/files/whatsapp_apk_para_blackberry_9720.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/6077/2002/files/coordination_chemistry_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/sosozifufeka.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_off00003f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F77 5044 bytes
SHA-256: f9e2b1bcd841249f880182c1fa5ede69d6f14697f9c6d72638b6239d86aa68bf
font_01_sfnt_off000050ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50AD 9480 bytes
SHA-256: b15e5be527646c44a84ec52c83b7d6be909e2e49303850fd0070fd43656f970f
font_02_sfnt_off000070cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70CC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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