Malicious PDF — malware analysis report

Static analysis result for SHA-256 462d900c1b0a1ae8…

MALICIOUS

PDF

42.5 KB Created: 2020-08-18 15:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb86c74cfe744ca71d89b3250a6ea2fe SHA-1: 35f05cd3c5d7ef69182fc43ccfa0e5ea33109719 SHA-256: 462d900c1b0a1ae8d058faa960d3df93cacb0a738c41ed5d0d5275455a4bc736
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a large number of embedded links, including one pointing to a known malicious redirector. The document body contains garbled text but also includes the URL 'https://ttraff.ru/pify?keyword=btwin+triban+3+size+guide', which is associated with malicious redirector infrastructure. The presence of numerous links, many hosted on Shopify, suggests a link farm designed to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=btwin+triban+3+size+guide
    • http://files.newcreationdaylilies.com/uploads/1/3/2/6/132683181/zixavetok_jolovimozefibe.pdf
    • http://pebine.tpched.org/uploads/1/3/1/4/131453870/jaxidute.pdf
    • http://files.trevormlewis.com/uploads/1/3/1/3/131381919/kebesejefixuw-linutozamame-masaxu-sosutabir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0297/7700/files/jirifozixelenategis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0872/files/82541304660.pdf
    • https://cdn.shopify.com/s/files/1/0429/5350/6969/files/84615084126.pdf
    • https://cdn.shopify.com/s/files/1/0435/4280/6679/files/78072732129.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/nazirajudedufijodope.pdf
    • https://cdn.shopify.com/s/files/1/0435/4015/2479/files/driver_brightness_control_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0433/7660/7390/files/bennett_mechanical_test.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/balasaheb_shinde_book_download.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_off00005f48.bin
5f4ef42adac3dcbdca0f3880678bb92a7bf4047a1976d92a2d33a50c9cea77db
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F48 5456 bytes
font_01_sfnt_off000071ec.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x71EC 1800 bytes
font_02_sfnt_off00007a7a.bin
0aae9cbdca0a3e42e2e2e5775c01e25213bc59f715cc1b81c97dc8fc962d4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7A 10088 bytes