Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c70b0e5e5cd4fb…

MALICIOUS

PDF

47.2 KB Created: 2020-08-23 06:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0647f9910760ba0ed20998a8da2feaaf SHA-1: 6b405630e890fd4633e15c558ad77e7193522462 SHA-256: 86c70b0e5e5cd4fbc210b0da93b3a8ae2033063a4a82928bb7af6a369e45305e
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to what appears to be a link farm hosted on Shopify, with one critical link identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'money counting worksheets' and includes the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also flagged this PDF with high confidence.

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=money+counting+worksheets+2nd+grade
    • http://files.gameplayer.dk/uploads/1/3/1/1/131163832/nemib_wikelazavavamet_puxejov_zelupubenutij.pdf
    • http://files.storyofayumerta.com/uploads/1/3/1/4/131482962/dd82b1b3460902.pdf
    • http://pabut.ftmaagojuryu.com/uploads/1/3/0/7/130775248/bdee39.pdf
    • https://cdn.shopify.com/s/files/1/0431/7167/6314/files/hp_pavilion_all_in_one_pc_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/0887/4906/files/616514391.pdf
    • https://cdn.shopify.com/s/files/1/0432/4845/1739/files/factoring_quadratics_worksheet_math_aids.pdf
    • https://cdn.shopify.com/s/files/1/0433/7405/1493/files/29842074819.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/2139480392.pdf
    • https://cdn.shopify.com/s/files/1/0434/4512/5281/files/kibodevufoguzubefopat.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/idontwannabeyouanymore_piano_sheet_letters.pdf
    • https://cdn.shopify.com/s/files/1/0437/8158/7093/files/98895335807.pdf
    • https://cdn.shopify.com/s/files/1/0428/6640/9638/files/36559402001.pdf
    • https://cdn.shopify.com/s/files/1/0435/8645/3663/files/mixed_addition_and_subtraction_word_problems_3rd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1079/files/16642753276.pdf
    • https://cdn.shopify.com/s/files/1/0436/5746/1913/files/balance_sheet_items_definition.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/
    • https://cdn.shopify.com/s/files/1/043

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000674d.bin
c95a405989b1902c41a7da47f44fbc5855d35cf2ec05fb23c78e3da67517f86b
pdf-font-stream PDF embedded font (sfnt) at offset 0x674D 5448 bytes
font_01_sfnt_off000079e9.bin
81edf6c2b294f3864a60390acf98030d67f4d5e5c488ecda9cf509feaa644ea7
pdf-font-stream PDF embedded font (sfnt) at offset 0x79E9 11944 bytes
font_02_sfnt_off0000a116.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xA116 4324 bytes