Malicious PDF — malware analysis report

Static analysis result for SHA-256 824f2dd51819a02b…

MALICIOUS

PDF

43.0 KB Created: 2020-09-01 22:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4992b2776b7c80d77f2a987529cd543 SHA-1: efa8e689ed2cb6e88b3c137aca199769ca1ec836 SHA-256: 824f2dd51819a02bc3d2a44ad67091beaef6d39392b08b24855f9695ad490ab6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to Shopify-hosted PDFs, and a critical redirector URL. This suggests a link farm or redirection scheme designed to lure users to potentially malicious websites or phishing pages. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=achtung+die+kurve+dos
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2926/4546/files/48080939374.pdf
    • https://cdn.shopify.com/s/files/1/0436/3301/6982/files/97766948655.pdf
    • https://cdn.shopify.com/s/files/1/0432/5546/4104/files/neumonia_bacteriana_2018.pdf
    • https://cdn.shopify.com/s/files/1/0434/9437/5576/files/zogatasodulu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/8060847233.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/gta_3_cheats_pc.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f72ec573f884ae893bda899ac3d085f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7603f3b730b4ec0a5627ef94f09ea5f.pdf
    • https://static.usrfiles.com/ugd/e3c460_5c0ab9a71ed54ebfa22848072e4e8f5d.pdf
    • https://static.usrfiles.com/ugd/d55797_14af495db9a0458cb8f89db65f839091.pdf
    • https://static.usrfiles.com/ugd/10a4aa_1706e2920d12405384a652e00761bd77.pdf
    • https://static.usrfiles.com/ugd/73c254_024e4713035c4ffd8fd7c2d0df0ff509.pdf
    • https://static.usrfiles.com/ugd/b8c837_f27b1b26760645159a8becefc4c798b6.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000692f.bin
7e4c94952ff0705851b77f7d53b25c75a7e88873fb8b771ebb4a4f39659a8b34
pdf-font-stream PDF embedded font (sfnt) at offset 0x692F 5072 bytes
font_01_sfnt_off00007a76.bin
918b6e3c8de0bb597fcc9167a7ea0a0730d5f10effd39c32606522d5589ff1b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A76 11288 bytes