Malicious PDF — malware analysis report

Static analysis result for SHA-256 948b0a8d5371916b…

MALICIOUS

PDF

96.3 KB Created: 2020-07-08 17:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e07d11461c2ec825ad836dc0b282688a SHA-1: 259f7a78b1885277996b06a36930276499472c44 SHA-256: 948b0a8d5371916ba8a245278fa40a33edec369a87c695e6bf57aebbe7c3c2bc
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with a prominent link directing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The presence of a link farm suggests an attempt to game search engines for traffic, likely to distribute malware or facilitate phishing. 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.cc/wb?keyword=pdf%20xchange%20editor%20windows%2010
    • http://files.mackeiganmarketing.com/uploads/1/3/1/4/131452732/sodopafesub.pdf
    • http://files.biggsbassethounds.com/uploads/1/3/1/8/131857071/84fb7a2093dbc.pdf
    • http://files.impunity.site/uploads/1/3/2/6/132681204/lefopogi.pdf
    • http://files.hermosawebdesign.com/uploads/1/3/1/4/131407823/jekunekiwijuj.pdf
    • http://files.solitaryislandsgamefishingclub.com/uploads/1/3/1/3/131379115/jisobudi.pdf
    • http://files.stampexinternational.co.uk/uploads/1/3/0/7/130739383/zozewisibu_danenugoravinas_zibazoned_vinudi.pdf
    • http://files.upwardfacinglife.com/uploads/1/3/1/4/131436971/velolerulamur_baxafijirun.pdf
    • http://files.ambleon.net/uploads/1/3/1/0/131070125/zulalusimutolosu.pdf
    • https://rizamiwi.files.wordpress.com/2020/07/jorufaparagalurumege.pdf
    • https://bijojaraduk.files.wordpress.com/2020/06/5393011894.pdf
    • https://puxofiguf.files.wordpress.com/2020/06/416608347.pdf
    • https://jezalur.files.wordpress.com/2020/07/88866381097.pdf
    • https://vimagifa577894512.files.wordpress.com/2020/06/85315475527.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zugazad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.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_off00012ef3.bin
f8efa8b2b5997d7126bb994dfeb69b329dc308aa21325b523ae31bcc33520f94
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 5396 bytes
font_01_sfnt_off0001414c.bin
d99f40741b51e908fc2a19beae55e16a9331d643c6d829ba5a028032731514fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 22796 bytes