Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0083946fe27495…

MALICIOUS

PDF

55.2 KB Created: 2020-07-30 18:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 363a93254d84a1a9321a56bc1ca28b76 SHA-1: 9751a0eb7f9dd69e971746bf137ebb9f070c79a2 SHA-256: de0083946fe274953d0501b6c59f906d0b03adfd5f11503b24f591a53f7d09da
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a 'PDF SEO Link Farm'. One of these links, 'https://ttraff.cc/pify?keyword=east+iceland+map+pdf', points to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which is sometimes used to create malicious documents.

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://ttraff.cc/pify?keyword=east+iceland+map+pdf
    • http://files.apeandape.com/uploads/1/3/2/8/132814439/4927961.pdf
    • http://files.katherinedaugaardart.com/uploads/1/3/1/8/131872105/9a3deb67.pdf
    • http://files.ritosrepellant.com/uploads/1/3/2/6/132695445/7f1466aa.pdf
    • http://files.katherinegould.com/uploads/1/3/0/9/130969561/5121807.pdf
    • http://files.cuttingedgewealthadvisors.com/uploads/1/3/1/4/131406365/3c99b.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/zimikug.pdf
    • https://cdn.shopify.com/s/files/1/0434/2140/1237/files/83041623279.pdf
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/kudobo.pdf
    • https://cdn.shopify.com/s/files/1/0427/5362/2182/files/22048415436.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/juzutusoviwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofolevunukexus.pdf
    • https://cdn.shopify.com/s/files/1/0431/6705/6028/files/21925659086.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mijafovaginidobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/wijepigarukoru.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0090/files/xewijokizinedalumanaviwu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3849/8206/files/jazipesemolib.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009be5.bin
d8a955ae42ebdf305d58f92604b3308024147046d29f7ebfd37f3a5ee771fdd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BE5 4840 bytes
font_01_sfnt_off0000ac3e.bin
9edcc6487622b75751ef341ae89f4535287d597f964101de49e52277acac1fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3E 10316 bytes