Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2d69b6240b98fe…

MALICIOUS

PDF

32.5 KB Created: 2020-08-31 02:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4ca3b81e855ee7ad1ff90af7513b68f SHA-1: ae17cf45cccc728f482b30cb776e336bc5779e56 SHA-256: 9d2d69b6240b98fe1596e487bd7c6ba29adb342266eed8555050b415410c2e24
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=reported+speech+wh+questions+exercis'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on platforms like Shopify. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise malicious intent.

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=reported+speech+wh+questions+exercis
    • https://cdn.shopify.com/s/files/1/0432/6224/7075/files/green_lantern_corps_comic.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/kekuratex.pdf
    • https://cdn.shopify.com/s/files/1/0432/0323/1903/files/35559008422.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0247/files/62349456292.pdf
    • https://cdn.shopify.com/s/files/1/0432/0893/3540/files/62139313914.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/825975555.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ee06d60f0284a798a6b926a51b6b185.pdf
    • https://static.usrfiles.com/ugd/565485_ceb0b870be714abc90b8ca3da2852fd1.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_fc104569bd204de49993830e6cbe35cf.pdf
    • https://static.usrfiles.com/ugd/65b209_09c1c69599f143608aa1f7444e541a6d.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/ditomibomivota.pdf
    • https://cdn.shopify.com/s/files/1/0437/7162/5621/files/holy_bible_amharic_study.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4266/files/shadowing_n5.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/68347398187.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_off00004365.bin
d0ff1e5b4d65728118719bea5c7280b7321a4003b009e9c98d9a7e5a7eeb9868		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4365 5212 bytes
font_01_sfnt_off00005536.bin
662b4081fd478e86130ab819508984f303497e3e855d93587eddc24b3db75494		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5536 9352 bytes

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