Malicious PDF — malware analysis report

Static analysis result for SHA-256 62603c38628a8e38…

MALICIOUS

PDF

42.1 KB Created: 2020-10-28 19:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f56c36c9abcce72628348bd1c030c8fe SHA-1: 6376647d57c6da41189a23a77241ca629e3031d4 SHA-256: 62603c38628a8e38be300ad249999ad32fa75305ee9fb6599be44157d6fe271c
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that the link `https://cctraff.ru/strik?keyword=c%252B%252B+doubly+linked+list+class+example` directs to malicious infrastructure. The presence of a large number of external PDF links, identified by 'PDF_SEO_LINK_FARM', suggests a link farm or SEO poisoning attempt to distribute malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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://cctraff.ru/strik?keyword=c%252B%252B+doubly+linked+list+class+example In PDF document text
    • https://furureseseruwa.weebly.com/uploads/1/3/4/4/134481841/tojewa.pdfIn PDF document text
    • https://lijonalorobu.weebly.com/uploads/1/3/4/3/134340538/napujanebi.pdfIn PDF document text
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/buvivegoxazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f87082e9b1d7.pdfIn PDF document text
    • https://vokujesezi.weebly.com/uploads/1/3/4/3/134306830/790d62a4f2852.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/e93bc161.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/seluke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5ee511-5f1b-48c9-9cbf-d30231e57ccf/85796956247.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0275/1905/files/xigov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5440/2202/files/11367887969.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/education_philosophy_of_john_dewey.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5978/1023/files/kubovarevoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4891/8951/files/orin_touhou_cute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/3420/3050/files/take_the_cannoli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8506/2846/files/chemistry_stoichiometry_worksheet_mass_mass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6644cc62-e866-420e-8cd0-a01e06dd07ee/96806522965.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/lenarigewezoxenebolojalen.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_off00006429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6429 5404 bytes
SHA-256: da74ea1aed00aef8455236a60726bf346a178e2139b3e0d7f9e0109ae417ae6c
font_01_sfnt_off00007680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7680 10780 bytes
SHA-256: 9e6b7941ba65bc5eb36f6ac0907345d94a71f4c2b692ac28af3ba808dc2c3e93

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