Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1135b39c5ad6e47…

MALICIOUS

PDF

43.6 KB Created: 2020-08-19 09:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dbb67d83f63f1472ee6e23df4407864 SHA-1: bfabfd6549471bf532d0f81360ac10bad200017e SHA-256: e1135b39c5ad6e477a6728ed98c10a3914faa394281ce3e482d0a47c3f8e48e3
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily garbled, contains text that appears to be a lure for 'Crosskr vpn browser for android'. The presence of numerous external links, many pointing to Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to the malicious redirector.

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.com/pify?keyword=crosskr+vpn+browser+for+android
    • http://nugijanaw.usaboxingmetro.com/uploads/1/3/0/7/130776485/pinuduluxosugo.pdf
    • http://sodafave.mrknifeguy.ca/uploads/1/3/1/8/131857758/xikasofuna.pdf
    • http://files.wesleyancollegemetz.com/uploads/1/3/2/6/132695915/cf4a2b2021.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/fishing_guide_osrs_f2p.pdf
    • https://cdn.shopify.com/s/files/1/0436/1096/4131/files/gujiwenuxuxofiwizumenegon.pdf
    • https://cdn.shopify.com/s/files/1/0437/6628/4439/files/beatstep_pro_manuale_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/mechanical_engineering_formulae.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/fanimasawaxunokaludabesig.pdf
    • https://cdn.shopify.com/s/files/1/0432/3141/2379/files/hackintosh_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/9028/0609/files/dewofudetovanobupomifoxim.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/sikenoxikavakoforogejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2018/0894/files/58029687671.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/tubuwuxetinar.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/nevetabuximim.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_off00006c28.bin
8447e7080316f2052382a8301d4e25269751cd5e950558cd651cdc628ca5d226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C28 5264 bytes
font_01_sfnt_off00007e2e.bin
cb42e7907e5be373dbe1f6741e3208e8e0d90ee8d53fa4922004ba2c2c2069f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2E 10292 bytes

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