Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc9cd4d0b2a4e87…

MALICIOUS

PDF

82.5 KB Created: 2020-11-19 12:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 758b1eaca12aa4ad43095fb8fb6f140f SHA-1: 1aaaf9eb5ad84678c59709cde8195f8873d746ef SHA-256: afc9cd4d0b2a4e87d50641b0fc69a5966a4d160d11b4bf1b0d7640081873aa61
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL, 'https://cctraff.ru/strik?utm_term=descargar+peliculas+marvel', is a clear indicator of malicious intent, likely serving as a lure for users interested in movie downloads. The ML classifier and ClamAV detection further support the malicious nature of this PDF, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?utm_term=descargar+peliculas+marvel
    • https://pegelukiratek.weebly.com/uploads/1/3/4/5/134503056/fukobawam.pdf
    • https://rosojuvawava.weebly.com/uploads/1/3/4/7/134719385/96f3bb2cbc2.pdf
    • https://cdn-cms.f-static.net/uploads/4418786/normal_5f9760e84ea8a.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/93049f265a0000.pdf
    • https://cdn-cms.f-static.net/uploads/4380869/normal_5f9327e6b6b46.pdf
    • https://javowutimor.weebly.com/uploads/1/3/4/0/134016661/6553343.pdf
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f871f1823040.pdf
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f87263876e95.pdf
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5f94adb572779.pdf
    • https://pafasuletelaw.weebly.com/uploads/1/3/4/4/134447528/5377502.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/796bcf4f-48bc-4c07-80f1-224fded418c1/linea_del_tiempo_del_procesador.pdf
    • https://s3.amazonaws.com/pazifetanegapu/sobafuwumusokiwopekarit.pdf
    • https://s3.amazonaws.com/tevigotu/kurarifutotux.pdf
    • https://s3.amazonaws.com/mamukawaxatali/past_perfect_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/bd813acb-de21-4e2c-b456-7c7eb154714b/48765175546.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2be.bin
9811ce2e1fd55acf9a6d0da02bc296a06475236d33377162c28417ac24f8a010		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 4896 bytes
font_01_sfnt_off0000e366.bin
c4d807708af498dcea6a81b340bf9b1ab22df99be7b8f25283e9292afa4f1490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 2324 bytes
font_02_sfnt_off0000ee03.bin
2243bda47f9e7148edd23798f8764d732d31211874666c4605061255a9c6495d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 12368 bytes
font_03_sfnt_off000115ec.bin
e890b0745305b197a8a2d91949e1170fe04a78ec0c9c0f8184b9a7d0702edb98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115EC 16568 bytes
font_04_sfnt_off00012bfc.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFC 4324 bytes

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