Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f070b8f8610eb4…

MALICIOUS

PDF

45.0 KB Created: 2020-07-30 16:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcd49997d9f546d5613e9192666010b1 SHA-1: d9aa639f72e2f666dd54be29ea708f52d60318ea SHA-256: f1f070b8f8610eb42b758ca83a5d852b8f1d64b87cf69b86353704ee9af3d829
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be related to a 'ms word to pdf converter', a common lure. The ML classifier also flagged this PDF with high confidence. The primary attack vector involves redirecting the user to malicious infrastructure via embedded links.

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/pify?keyword=ms+word+to+pdf+converter+offline+software
    • http://files.tacomateasandherbs.com/uploads/1/3/0/8/130814516/nasoganinuxamun_dawaboloda.pdf
    • http://files.trampleals.org/uploads/1/3/1/3/131398360/puwewuge.pdf
    • http://files.frankklohr.com/uploads/1/3/1/4/131437119/8938845.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/fewidubitafikodokun.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/gisuji.pdf
    • https://cdn.shopify.com/s/files/1/0430/9617/8845/files/9241730517.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/zevosisazuronusesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/58123238783.pdf
    • https://cdn.shopify.com/s/files/1/0434/6350/8121/files/64199698894.pdf
    • https://cdn.shopify.com/s/files/1/0430/6917/8017/files/90905810993.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/78216455809.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4751/files/15799340505.pdf
    • https://cdn.shopify.com/s/files/1/0434/1353/6925/files/99606986674.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_off00007334.bin
c36954728868f3f1197db6bf0c68779c06fad0123d423f3867d8c2a2208c6a8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7334 5096 bytes
font_01_sfnt_off000084b4.bin
c2921027e076b377281bd8e0cfef1fce0611d6ace23d22e05cbc3a7114669fce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84B4 10000 bytes

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