Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91757b9cbb04e25…

MALICIOUS

PDF

48.4 KB Created: 2020-08-18 20:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 993eca3fb54cc18f1d6eba5391107aac SHA-1: b81986c6bd7da54cb9043159b9fc687b74760273 SHA-256: f91757b9cbb04e2518c66571461aeacc8d4da445e17e21618bb0ce028fc2f538
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=tools+used+in+big+data+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to lure the user to this malicious site.

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=tools+used+in+big+data+pdf
    • http://files.thepractitionertable.com/uploads/1/3/2/6/132682030/lolilixon.pdf
    • http://files.cuttingedgepoodles.com/uploads/1/3/0/8/130813934/1270724.pdf
    • http://files.spoonful-osaji.com/uploads/1/3/0/7/130739664/buzokim.pdf
    • http://puzem.deleswaproductions.com/uploads/1/3/0/8/130874493/3983258.pdf
    • http://files.timdewittphotography.com/uploads/1/3/0/8/130874422/6912932.pdf
    • http://files.cuttingedgepoodles.com/uploads/1/3/0/8/130813934/
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/38178377781.pdf
    • https://cdn.shopify.com/s/files/1/0437/8293/0593/files/nisipizukisemole.pdf
    • https://cdn.shopify.com/s/files/1/0448/4576/0669/files/liwagira.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/19576843295.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/19549950741.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/53677801395.pdf
    • https://cdn.shopify.com/s/files/1/0440/1253/5958/files/1552815521.pdf
    • https://cdn.shopify.com/s/files/1/0428/6811/3574/files/business_analysis_articles.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3687/files/tojakagebelifokef.pdf
    • https://cdn.shopify.com/s/files/1/0430/9263/9897/files/heart_disease_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9575/files/buchungsstze_bungen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007251.bin
b2f4b67cf21eaa397eefdb66f04f80976721c5c50ff78919e102e4028f26232e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7251 5084 bytes
font_01_sfnt_off000083a7.bin
ecd362c99cf9d4d4e56db579808e2f66f496f8708ac49cee11fb9ca81eed91d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x83A7 10208 bytes
font_02_sfnt_off0000a688.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xA688 4324 bytes