Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb31901002ce6ed4…

MALICIOUS

PDF

55.4 KB Created: 2020-08-14 15:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a1fa9cb40c17be311c8d90f81808be8 SHA-1: b5c27befee8f6ef773458169fe68f4e2c4ecbfc7 SHA-256: eb31901002ce6ed40b0e78869789ab278c8256abf761320f997b33c9e57a838e
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.cc/pify?keyword=listening+cambridge+5+test+2+answers'. The document body, though heavily obfuscated, contains text fragments related to 'listening cambridge 5 test 2 answers' and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, with the first being 'https://cdn.shopify.com/s/files/1/0432/3459/0878/files/oxfordshire_stroke_classification.pdf', which is likely part of a link farm to improve search engine ranking for malicious content.

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=listening+cambridge+5+test+2+answers
    • http://files.mtsthelenstshirts.com/uploads/1/3/0/7/130739004/252ed5009b.pdf
    • http://files.smhulse.com/uploads/1/3/2/6/132681053/3689513.pdf
    • http://files.victoriawaterfronttours.com/uploads/1/3/0/8/130873937/70f4e208.pdf
    • http://files.7466caulkproject1.com/uploads/1/3/1/4/131437246/565bc98a277.pdf
    • http://pufida.tynesidebookclub.com/uploads/1/3/0/7/130740145/3472526.pdf
    • https://www.ieltsxpress.com/wp-content/uploads/2020/01/162_deep.mp3
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/oxfordshire_stroke_classification.pdf
    • https://cdn.shopify.com/s/files/1/0429/4030/1478/files/kavagofi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/28806641765.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/swtor_unspecified_error_try_patch_again.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54748680829.pdf
    • https://cdn.shopify.com/s/files/1/0437/6795/5610/files/raletapoluzilizujizezareg.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/advantages_of_internet_advertising.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6534/files/alien_name_generator.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9974/files/cumulative_sum_control_chart.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/foxokexesofidizojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/20455163981.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_off0000990e.bin
0dcdf643beb847e119c30c91b5bf4dddd1943c6caf187c11e8ac76eae832709e
pdf-font-stream PDF embedded font (sfnt) at offset 0x990E 5656 bytes
font_01_sfnt_off0000ac47.bin
48e4ab54c5b19fa03a0fa02b1839df3eca69af20a726447d73fea8cc66d7bf88
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC47 10488 bytes