Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8d9b9731a81044…

MALICIOUS

PDF

50.5 KB Created: 2020-07-28 04:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b79308f4adaa634e2a69c0d8a2c7ae1 SHA-1: 5c39ab5a81469af6f2b7da0799253825dc7a0f5b SHA-256: 1b8d9b9731a81044fdb9f33e20d375f8b3808b6b3d435b5c8ac37c085edb0963
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=pop+piano+sheet+music+with+letters', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'Pop piano sheet music', suggesting a lure to disguise the malicious intent. The file's creation by wkhtmltopdf suggests it might have been generated programmatically to host these links.

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.ru/pify?keyword=pop+piano+sheet+music+with+letters
    • http://files.ecrirebeaute.com/uploads/1/3/1/8/131856703/zefob.pdf
    • http://files.revivalfamily.ca/uploads/1/3/1/6/131636951/8420405.pdf
    • http://files.clearlightastrology.com/uploads/1/3/1/4/131436956/8830642.pdf
    • http://files.detroitlakesucc.org/uploads/1/3/1/4/131406855/dibipaxilifovez.pdf
    • https://cdn.shopify.com/s/files/1/0438/5128/4642/files/62991300323.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/laroroligebodegudepabi.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3336/files/97873768429.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12091312038.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/vejade.pdf
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/23021840365.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9639/files/17231629370.pdf
    • https://cdn.shopify.com/s/files/1/0431/4447/8874/files/44687579.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/67199270375.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/kokitoxosaxufebufijifisuw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5357/2515/files/79821733693.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52657742202.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_off00007e6c.bin
326cb39ffaa36dcadb2d30758bd4c419db7576f2fac5d6633a200a2c16753b9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6C 5148 bytes
font_01_sfnt_off00008fc1.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC1 1800 bytes
font_02_sfnt_off0000984f.bin
48b3b9b58ff5ec095426eeae91dcff4eac8aa3efb622f45a09463b90c6780d01
pdf-font-stream PDF embedded font (sfnt) at offset 0x984F 10408 bytes