Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d19106a2a764d37…

MALICIOUS

PDF

70.0 KB Created: 2020-08-21 00:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c337fd460cefba8826a3e0df51e2b3 SHA-1: a3b1260b1ad92bfd9def8e955fc103239d441366 SHA-256: 3d19106a2a764d37c309eef5cbc2af9ae70dcf5867aa3d964f0c8e683d112489
152 Risk Score

Malware Insights

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

The PDF contains a deceptive message and multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.cc/pify?keyword=please+be+guided+accordingly+in+tagalog. The document also contains a link farm pointing to numerous PDFs hosted on cdn.shopify.com, with the first identified being https://cdn.shopify.com/s/files/1/0434/0570/5374/files/bubikivifum.pdf. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=please+be+guided+accordingly+in+tagalog
    • http://files.nosciastudios.com/uploads/1/3/0/8/130874627/lufuvi.pdf
    • http://files.sacredstonez.com/uploads/1/3/1/0/131070604/6585321.pdf
    • http://wofije.ancientwavestudios.com/uploads/1/3/1/8/131857120/f7beaf128.pdf
    • http://files.projectdaretodream.com/uploads/1/3/0/7/130776164/28ffbd51b.pdf
    • https://cdn.shopify.com/s/files/1/0434/0570/5374/files/bubikivifum.pdf
    • https://cdn.shopify.com/s/files/1/0430/6852/2657/files/lelefizavutawokome.pdf
    • https://cdn.shopify.com/s/files/1/0428/8305/5782/files/91606489380.pdf
    • https://cdn.shopify.com/s/files/1/0428/0667/3574/files/dewip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56773010908.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/88389691602.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9659/files/kewirirezitatepujivez.pdf
    • https://cdn.shopify.com/s/files/1/0430/6511/4775/files/61984796707.pdf
    • https://cdn.shopify.com/s/files/1/0445/1749/0847/files/pefujefejatamudotesiset.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/59802834033.pdf
    • https://cdn.shopify.com/s/files/1/0430/3339/5353/files/faxafenevo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4923/8184/files/1772683703.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_off0000cd31.bin
d7c8e9bca58a2f7ad53b591182272a28c5e8d90617a88978f1878c38017b61d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD31 5348 bytes
font_01_sfnt_off0000df64.bin
d9946d6756f5b4de6d5686bb25afa89a6adf60aa78690c590d6098a951471d4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 13376 bytes

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