Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc86cd1102d30da5…

MALICIOUS

PDF

41.3 KB Created: 2020-10-07 22:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e5144b8494828301b347f6c0a34d0dd2 SHA-1: d907fd7f5d7aa9c3584d2ec9c4ea60fdad05699d SHA-256: bc86cd1102d30da509024f19c047d77817c37969713fdd9001af15f203440d6d
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, potentially for further exploitation or phishing.

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://gettraff.ru/strik?keyword=precalculus+polynomial+worksheet+with+answers In PDF document text
    • http://files.theathinai.com/uploads/1/3/0/7/130776183/didog-wuzit.pdfIn PDF document text
    • http://lifot.thisdiaspora.net/uploads/1/3/1/8/131856257/saxoruwinem_lubodezozisis.pdfIn PDF document text
    • http://puwezegi.clarobotics.com/uploads/1/3/1/4/131437619/8550711.pdfIn PDF document text
    • http://files.dominickmscialabba.com/uploads/1/3/1/1/131163747/gigerelu.pdfIn PDF document text
    • http://kusimaja.tidridge.com/uploads/1/3/1/4/131453718/9586443.pdfIn PDF document text
    • http://files.eugenesoundproofing.com/uploads/1/3/2/6/132695306/589973.pdfIn PDF document text
    • http://rowaxoso.ilovebuttercups.com/uploads/1/3/2/7/132710589/4912748.pdfIn PDF document text
    • http://files.bizfxmedia.com/uploads/1/3/1/4/131408741/4387937.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://cdn.shopify.com/s/files/1/0482/2754/9338/files/16828163997.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3281/8076/files/neutrogena_clean_shampoo_normalizing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6852/5218/files/nibisofovajisidavuvagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0106/8708/files/zelonadirodewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ba26301-e51c-4790-9e42-c3505ffd1c57/60808536224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16e4ee9f-cc0a-4b2a-aa90-d283d4261b6b/bekarujabesubazukejuman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88424199-341f-4543-9c11-f4861e31cce4/49822777897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fdae0d-1147-4911-b6d1-1c246e198b1b/39563378926.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_off000049ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49EC 5316 bytes
SHA-256: d72bc861726baf3e2250ef88c060518ad9a094393af548a9b36f5d048521989b
font_01_sfnt_off00005bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDA 14020 bytes
SHA-256: 2dc03a632d051499314b904542e1922cfc1eaac1fd39c3ce655197aeff586619
font_02_sfnt_off00008757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8757 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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