Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d17f71a586d2f0…

MALICIOUS

PDF

56.7 KB Created: 2020-10-16 22:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: df95b53a7bd9f5e5131a3eb6e4117e65 SHA-1: e7a6d5c577b7b50d2cb381f34ca6de76ce3bac2b SHA-256: d5d17f71a586d2f00c8913c0dbd2248804c94bf3df78a26de41a61bccf7dfa42
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files, indicating a link farm for SEO manipulation or to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at https://cctraff.ru/123?keyword=university+of+michigan+campus+map+pdf. The document body, though heavily obfuscated, contains text related to a 'university of michigan campus map pdf' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/123?keyword=university+of+michigan+campus+map+pdf In PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/fukaxowoloto_salanokudewufev_rizefew.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/vobetaxasifov.pdfIn PDF document text
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/229687.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f8940f0c9e0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f88be55e1437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f872dfccf226.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5f898beed31b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8886796b1e4.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/fa1636c6-f782-4187-9489-955c1cd4e423/34566772804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c79091-2d1b-49ce-8ccb-b114fd24d2ef/nasezakanilapeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51a4e4f-4861-4852-8564-368dfdc8bb75/91679172947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16d045e-397f-4c62-a42b-6af0964c911e/kizevakumuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4fa29ca-1d4b-440f-a4f8-c49783de318e/61803873270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f47ce75-bc36-4af2-a353-86e8b139f778/79419596823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d15c100-33a3-4a80-991d-9ae8701aeb65/momujotesiwuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b6d50b-8561-4d9f-a9bf-af501f4bc161/38554193497.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8223/9137/files/blue_rose_is_line_dance.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5276/8666/files/genealogy_merit_badge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2908/6887/files/afk_arena_chest_of_wishes_halloween.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/pimorilig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4201/1798/files/android_studio_google_map_get_current_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac7ef15-d90a-494c-9c13-3e9133e8f5f5/zudagos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c791d86-ff75-4532-ba5d-ec855fa08e13/vinik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2122abf8-8b90-494e-8ed0-a3e913841351/49096929829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d596706-b174-478b-9356-0fb1ce0130a7/27561679173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf5668b-c7bb-4a38-af54-62556c5af974/56009514769.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_off00009933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9933 5692 bytes
SHA-256: d6a483f61686e22fcd4cb5e2e60555e96869a849159d35efb6413792b97f256b
font_01_sfnt_off0000ac73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC73 11792 bytes
SHA-256: 6aa11ceb4e14306c51041c3dd171ad2f1b9f4d2f863f45d42df77b19e8c77848

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