Malicious PDF — malware analysis report

Static analysis result for SHA-256 9647ada9356b4c5e…

MALICIOUS

PDF

48.9 KB Created: 2020-08-12 22:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 328277f4f1e7f9b1b2830703b2512cc7 SHA-1: cc7d7261f5ee7d9f9dd82b8054fd0d26c19e273a SHA-256: 9647ada9356b4c5e0d0bb3194eb733fb3b0e4bea0e059087d3fa0b2aa1f580fb
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to a known malicious domain. The document body, though heavily obfuscated, contains the same redirector URL and a title suggesting a technical manual, likely to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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.com/wb?keyword=conmed%20smoke%20evacuator%20service%20manual
    • http://files.northparentpress.com/uploads/1/3/0/7/130775728/9745002.pdf
    • http://dilebimu.easthamptonteachers.com/uploads/1/3/1/4/131407440/fapidesejapukof_pokat.pdf
    • http://files.colvigconsulting.com/uploads/1/3/0/8/130814408/28727e883.pdf
    • https://cdn.shopify.com/s/files/1/0435/2330/9727/files/madirulibawita.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/duxaladumorabujavok.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5151/files/kafilataxivuxet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44994208471.pdf
    • https://cdn.shopify.com/s/files/1/0430/9273/8201/files/18165394143.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/used_vehicle_information_package.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/vatuxezotipepas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/tablature_accord_guitare_facile.pdf
    • https://cdn.shopify.com/s/files/1/0431/2386/7805/files/71192313929.pdf
    • https://cdn.shopify.com/s/files/1/0432/9357/3284/files/74023825817.pdf
    • https://cdn.shopify.com/s/files/1/0435/5224/3861/files/moviebox_ios_8._0.pdf
    • https://cdn.shopify.com/s/files/1/0437/0222/3013/files/kumarevimukigiridisaxut.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c81.bin
c35c22628f0cf66c8a402738ebb9ab9488f9321f2027478ebb06c5e7392760ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C81 5116 bytes
font_01_sfnt_off00007dd0.bin
f871c8bcdf112731cd98725e84feb1b11ecb7acf97a33da0904214a46fd8877c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD0 13128 bytes
font_02_sfnt_off0000a8a4.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A4 4324 bytes

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