Malicious PDF — malware analysis report

Static analysis result for SHA-256 a867e6f73f815d51…

MALICIOUS

PDF

39.2 KB Created: 2020-09-02 09:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b092026f298cc166e00bbf0bff250934 SHA-1: e32694182992b08afc7f3489962c513f12fe37ea SHA-256: a867e6f73f815d51462913c5116298bea36603f268e05c932016fdfb578b3847
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.cc/wix?keyword=strut+and+tie+model+pdf'. Another critical heuristic indicates a PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0436/1335/6189/files/one_day_matisyahu_lyrics.pdf'. The ML classifier strongly suggests maliciousness. The document body contains garbled text but includes the suspicious URL, indicating a likely attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=strut+and+tie+model+pdf
    • https://cdn.shopify.com/s/files/1/0436/1335/6189/files/one_day_matisyahu_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/5570/1398/files/44073481800.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/i-_134_sample.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2621/files/65884382721.pdf
    • https://cdn.shopify.com/s/files/1/0463/1707/6637/files/bawasajotuvat.pdf
    • https://cdn.shopify.com/s/files/1/0430/6436/1113/files/jazz_clarinet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/rewok.pdf
    • https://cdn.shopify.com/s/files/1/0451/9487/0935/files/bs_english_literature_notes.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/micropaleontology_foraminifera.pdf
    • https://cdn.shopify.com/s/files/1/0434/4138/9724/files/69541872901.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/naxazijasawebitokijile.pdf
    • https://cdn.shopify.com/s/files/1/0439/7321/4366/files/online_brochure_maker.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/41238760715.pdf
    • https://cdn.shopify.com/s/files/1/0434/2883/9586/files/wuwunujomazapamunugomin.pdf
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/fazegutafip.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/
    • https://cdn.shopify.com/s/files/1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c7f.bin
593b815c706f873cdc504f316a0e5ca137be641a72bd10f5cc8a2bccc2cdc07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7F 5112 bytes
font_01_sfnt_off00006dcd.bin
45d023d92bdc1f83fc6daf7c74fefba8c090b35b71c2ac496ae1eef527bc523f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCD 9944 bytes

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