Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2b63d2c0a86ac4…

MALICIOUS

PDF

42.4 KB Created: 2020-08-09 22:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9eb9722fc94408e2244203dcce4cdf3 SHA-1: f4f4337bd56243192182e5ee10396e15fe55f835 SHA-256: 4a2b63d2c0a86ac4c823be68f45a5ac02b1f4fb14dea23758569232275d70204
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to lure victims to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=composicion+amalgama+dental+pdf
    • http://wafaruvur.hfndpa.com/uploads/1/3/2/7/132712207/xixasigot-nefaxuzisopexo-xexedumazevida-dapelux.pdf
    • http://nobanimev.artsyus.com/uploads/1/3/2/8/132814930/ac241642b6.pdf
    • http://files.mandiecline.com/uploads/1/3/0/9/130969884/bapajapupowuzo-batavexi-dutafuriju-kavifiturutesot.pdf
    • http://files.amandanelsonart.com/uploads/1/3/1/1/131164431/zosowa-filakobiw-bibawe.pdf
    • http://files.icgpercussion.com/uploads/1/3/2/7/132712661/2031111.pdf
    • https://cdn.shopify.com/s/files/1/0432/2079/5556/files/tirovoket.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3344/files/sosaborurulifo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9715/1904/files/53077147366.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0969/files/xilezaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/18565612450.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/keparobak.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/netasifitu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2468/5975/files/zigozo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/10934374774.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1463/files/bjt_applications.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/20991159381.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/doxawinekodaxoxamituveji.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/51019077929.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_off00006844.bin
0b28f5e3c7bfebc546cdd8fa0adbde8b8ed3c844bde09e20adda2319e4ceea81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6844 5284 bytes
font_01_sfnt_off00007a27.bin
2e1f0b3ae0e1819e2a29b5443420bee5bd54a422e766d0e1d1810b598f53ca30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A27 10232 bytes

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