Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7f0405a8f26da0…

MALICIOUS

PDF

41.9 KB Created: 2020-10-30 15:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 49e07216acdf05bca4958dba5b11bcd7 SHA-1: 2209bb68b0a0ca76da01edf8f55c0cdc1df5a318 SHA-256: cd7f0405a8f26da08a0de47339065344070583fc94334c580cfdaadf75ddf81f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or spamming operation. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to direct users to harmful sites.

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/aws?keyword=animal+symmetry+worksheet+high+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f88a41feffc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f88561d543e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f8e02d8c9e5e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7274/0260/files/the_haitian_vodou_handbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8134/1339/files/jilimuvuduwubizolewabek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0186/2073/files/hurricane_carmen_1974_track.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a17ffda3-20e4-46ad-8bc3-dbfd09f6d635/73454152497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb2b7b9a-b139-4949-8e6c-5b3c6931aa76/regutafabaterewudigadope.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/9865/1804/files/pariksha_manthan_geography_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e339a80-cae5-4825-b9b5-991a1f74852a/wuxolowimexugubijesirigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a94ed782-82c5-402a-94d7-a8ca90916699/4977628894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55838ea8-d728-4c00-a98b-eae7d099913f/82837735626.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5743/0176/files/android_take_screenshot_samsung_s7.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_off0000680d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x680D 5460 bytes
SHA-256: fda2d5ede3f1e09fe4321118131064ed8eae40552366bdb524015c08b88c7f13
font_01_sfnt_off00007a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A87 9468 bytes
SHA-256: 7adeaf15310f23598eb41b6b3d74f9a0331bfb4e8d523796f8afd81a5ddb330d

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