Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c9a084135edf5e…

MALICIOUS

PDF

45.9 KB Created: 2020-07-21 02:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93dccd3fe0a8080cc64056edae8a6fe0 SHA-1: 219993043b40e91cede8fae68d4869a34aa20bd9 SHA-256: 27c9a084135edf5e665194f2673acaaef96a22349fbb78748fc4dd394a89720a
128 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious redirector and a fake invoice lure. It embeds numerous external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'bank statement entry', reinforcing the lure. The primary attack vector appears to be tricking the user into clicking the malicious link to a redirector.

Heuristics 4

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/wb?keyword=bank%20statement%20entry%20in%20tally%20pdf
    • http://files.pieplacechatt.com/uploads/1/3/0/7/130775554/limaxiwupikalu-gafuxa-bixik.pdf
    • http://files.justagirlwithapen.com.au/uploads/1/3/2/3/132302888/gowebogebomo.pdf
    • http://files.southpasgirlscouts.org/uploads/1/3/2/7/132740274/3423123.pdf
    • http://files.kyawomen.com/uploads/1/3/0/7/130776061/1060030.pdf
    • http://files.laurenleighhunter.com/uploads/1/3/0/8/130813859/waguziwerud.pdf
    • http://files.kyawomen.com/uploads/1/3/0/7/13
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/mavasalirogulezasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1424/9886/files/zokagige.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30151397197.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/mifamaxiwaporama.pdf
    • https://bogosakodulo.files.wordpress.com/2020/06/jezimuwa.pdf
    • https://molisapezu.files.wordpress.com/2020/07/59554400925.pdf
    • https://nuvomisegej.files.wordpress.com/2020/07/62849026547.pdf
    • https://cdn.shopify.com/s/files/1/0441/3197/5320/files/850723980.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/55964979514.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/xafalizi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0431/1305/4359/files/95328067112.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4564/files/32800827263.pdf
    • https://cdn.shopify.com/s/files/1/0430/2556/3801/files/60616383517.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/rijalib.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_off0000759e.bin
451fdffec14718bc8e2a47095842adf862ff418a7387c5a0a7134f1d950fab06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x759E 5080 bytes
font_01_sfnt_off000086cb.bin
ab19482ab3440dca8980c578886495f334c654b56c0ce074246a7a0e47be0d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CB 10560 bytes

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