Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb91fea9ae5fe33…

MALICIOUS

PDF

47.8 KB Created: 2020-10-29 18:38:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 328d51710c9bda885c00288072bb8673 SHA-1: 1ca27f4fbe02e52411fc1f5976d74b891f84ce88 SHA-256: fdb91fea9ae5fe33e5bf176ad23850b47bfd998855cc05beade6b01f14c210e3
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though obfuscated, contains references to 'saints row cheats' and includes the primary malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the presence of a known malicious redirector URL reinforces this assessment.

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/aws?keyword=saints+row+cheats In PDF document text
    • https://vozutadisifik.weebly.com/uploads/1/3/1/4/131483249/7464608.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420459/normal_5f9983108e0a7.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/1422683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381287/normal_5f8bcdb896d08.pdfIn PDF document text
    • https://wilunozuwi.weebly.com/uploads/1/3/4/4/134432110/e3850e.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/bfd5100d-9c71-405c-8401-3b17803b9020/turuzegovobomixuzidazan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/8786/2429/files/wigumefo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5250/3718/files/nakowilatufumipevaja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6335/2735/files/20115333223.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0424/7715/files/20491521234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40c5967-c044-4150-9572-b1c28d756374/51295713728.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1421/1742/files/kid_ink_promise_mp3_download_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6741/6998/files/16656393422.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_off00006a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A23 5332 bytes
SHA-256: 8daf94957cb8029556f6e8322f3b197143af92f64d219ba12b1fff02b9255e7c
font_01_sfnt_off00007c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C81 5052 bytes
SHA-256: 2fed9011f819006d34a4a60a5e58d1197bbe52a434ed4c9554f4cb010a71281e
font_02_sfnt_off00008db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB9 10864 bytes
SHA-256: a122ab3b4c168681771799bc8153a8d404e1c6141fb75b17c17c641649cf40dd

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