Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1179cae16854f42…

MALICIOUS

PDF

51.7 KB Created: 2020-10-27 21:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 502324cb83d679668ceb55b108ef072e SHA-1: 27fe7d8c82e2d4e6f89798f7c5bac92210e4e80e SHA-256: c1179cae16854f42d2d388dcaa148e19b67c667008888a00aeb1d9baa9c582bf
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though obfuscated, contains a URL that appears to be part of the link farm, suggesting an attempt to lure users to malicious sites for phishing or malware delivery.

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://ggtraff.ru/strik?keyword=once+upon+a+time+nadine+gordimer In PDF document text
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/9568082.pdfIn PDF document text
    • https://donibirumot.weebly.com/uploads/1/3/4/4/134463545/tiziwevop.pdfIn PDF document text
    • https://ruxodinari.weebly.com/uploads/1/3/4/3/134377607/mokumi_lawopas.pdfIn PDF document text
    • https://tezosarotijup.weebly.com/uploads/1/3/4/3/134305137/fulijaxovelizi.pdfIn PDF document text
    • https://rozujefugupag.weebly.com/uploads/1/3/4/0/134017035/kerujojiwom_gubev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f87644818f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f87365c18899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f8eef22e6b3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5f896e83da4d3.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/1/0268/8670/1256/files/fukipurofavabera.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3812/6492/files/24225908760.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0700/8168/files/pathophysiology_book_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2951/9272/files/vaporetto_routes_venice.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1436/4059/files/26159360466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2969/0530/files/sirafafodovas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9872/1442/files/2015_staar_english_2_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0364/0990/files/vodup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9201/9874/files/1281802202.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6965/1129/files/4228576509.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6416/2969/files/refixugevuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6add1451-66fb-4dce-99d1-707e952a9d8d/negipigoxoveromofixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7f6cc4-fe91-4a9e-a05e-b6583b81514a/32742788267.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_off00007e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E71 5092 bytes
SHA-256: dc22940d6d041bdaaa0392fd1a36996fec7d9c60a06ef6dfb508a065b77c9123
font_01_sfnt_off00008fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA9 10360 bytes
SHA-256: c480ce8cb2a423c6d00ea4d17c08f06bcd15d64db900a5f7936d905f07e3faaa
font_02_sfnt_off0000b326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB326 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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