Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec2d3b10ff50a7c…

MALICIOUS

PDF

126.2 KB Created: 2020-07-09 17:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 3b90ba918213f5a31ed55da464e27dae SHA-1: 450803c23e0d45c578e912bab94736f9c1ce6720 SHA-256: fec2d3b10ff50a7c879dbdbca87b6a3c90f2bc1875b811dfb075740e27bd76ef
184 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/wb?keyword=thai%20herbal%20pharmacopoeia%202016%20pdf`. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, including `http://files.putinbayweddings.com/uploads/1/3/1/6/131607374/4798954.pdf`. The document body, though heavily obfuscated, contains text related to 'Thai herbal pharmacopoeia 2016 pdf' and the wkhtmltopdf application, suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=thai%20herbal%20pharmacopoeia%202016%20pdf In PDF document text
    • http://files.putinbayweddings.com/uploads/1/3/1/6/131607374/4798954.pdfIn PDF document text
    • http://files.niassestudios.com/uploads/1/3/0/8/130874318/b919e96e4ba.pdfIn PDF document text
    • http://files.iyengaryogaojai.com/uploads/1/3/0/7/130738562/lenimaxigorosaseko.pdfIn PDF document text
    • http://files.littleladyboutique.shop/uploads/1/3/2/3/132303060/mavada.pdfIn PDF document text
    • http://files.basscoastpost.com/uploads/1/3/0/7/130775025/5831108.pdfIn PDF document text
    • http://files.whitepeacockcoffee.com/uploads/1/3/1/4/131436971/7dad80.pdfIn PDF document text
    • http://files.sgfbeef.com/uploads/1/3/0/8/130814066/tadukik.pdfIn PDF document text
    • http://files.bayleighscloset.co/uploads/1/3/1/4/131437454/bediduw.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://polisixojo511032843.files.wordpress.com/2020/07/gomedupafidilawo.pdfIn PDF document text
    • https://potavetuzeva.files.wordpress.com/2020/06/zunotixagapejekifab.pdfIn PDF document text
    • https://lizuvedofo.files.wordpress.com/2020/07/zelatefiwizesovaz.pdfIn PDF document text
    • https://fusikazisome.files.wordpress.com/2020/06/88121594052.pdfIn PDF document text
    • https://jemuxotuwigi.files.wordpress.com/2020/06/78458284746.pdfIn PDF document text
    • https://vepovuvub.files.wordpress.com/2020/07/tavutug.pdfIn PDF document text
    • https://pozugupikuza.files.wordpress.com/2020/06/62833982370.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/salelixakibikiziz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69440205977.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jufozigazagapuji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12035000993.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/futikuzazojexopuvenewipu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017c95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17C95 20988 bytes
SHA-256: cd773a39eb24e3a092859c2f77ab281d8fed8e63a7a2aee0484943527243fa07
font_00_sfnt_off00016a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5B 5388 bytes
SHA-256: 0f0f9f5ec1468b3c6314f08dd7c2e51a67bf408cf6a650a26c0fdfd7a53e2a48
font_02_sfnt_off0001b413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B413 16692 bytes
SHA-256: 8756fd29726f80ced3bb85cb4975ac59a9215432bd4402928054c183da5d58d5