Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee51adb5911e2a41…

MALICIOUS

PDF

55.1 KB Created: 2020-07-13 22:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af9ba47307e203f1ac13db6e7291ce4c SHA-1: 79f672a1a8d44c046194f6d095997bf914256035 SHA-256: ee51adb5911e2a414331327991201c1a765e0acb89bff0a3cc606f5928dba797
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wb?keyword=jumlah%20penduduk%20dunia%202019%20pdf'. This indicates the document's primary purpose is to trick the user into visiting a malicious URL. The presence of a large number of external PDF links also suggests a link farm or SEO manipulation tactic to obscure the malicious intent. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/wb?keyword=jumlah%20penduduk%20dunia%202019%20pdf
    • http://files.defrancefineart.com/uploads/1/3/1/3/131380083/difenapej-zenevegexusa-fomewiritonane-vusodat.pdf
    • http://files.thewineswirler.com/uploads/1/3/2/7/132740865/ee3c0f6b96212d6.pdf
    • http://files.karrathacaravanpark.com.au/uploads/1/3/0/8/130874501/c367936f4.pdf
    • http://files.kakapocakes.com/uploads/1/3/0/8/130813307/017e8771.pdf
    • https://bonokikaj.files.wordpress.com/2020/06/88781159324.pdf
    • https://makabusaban.files.wordpress.com/2020/07/22680119167.pdf
    • https://bubejiruzer907982527.files.wordpress.com/2020/06/32207936761.pdf
    • https://pulebikib.files.wordpress.com/2020/07/gegugufuligom.pdf
    • https://guzotigemidu.files.wordpress.com/2020/06/73505554487.pdf
    • https://kumitewefa.files.wordpress.com/2020/06/14899411210.pdf
    • https://fezipok.files.wordpress.com/2020/06/nosiselela.pdf
    • https://sonaloz.files.wordpress.com/2020/06/sapavuriz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15906675896.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/jidamonefoju.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/bediruwagamibapumugunen.pdf
    • https://cdn.shopify.com/s/files/1/0432/7194/6398/files/28624673256.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/fisir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mazimuzoxoku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0433/2270/4030/files/xukupani.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20785775646.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_off0000990f.bin
09c5fd647bf6528fdb25f049dbc339f48daed6712d900974ff2ea7a7ab22f03b
pdf-font-stream PDF embedded font (sfnt) at offset 0x990F 5232 bytes
font_01_sfnt_off0000aab2.bin
2637dbb86452ce25efc3d3c929d65553ef65065c3ac65a736fcb11ad77b87deb
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAB2 10588 bytes