Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1807b8f22c0200…

MALICIOUS

PDF

40.0 KB Created: 2020-08-14 20:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8de65e2186093450ece02eb6b9ca468 SHA-1: c0fd87b817f93a795a0f1022e4ef6ea1d5671267 SHA-256: ab1807b8f22c020042436c78cab42dc5f69d4adf3aacb49c95b0ec80b05a3f26
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify.com, likely as part of an SEO link farm. One critical heuristic firing indicates that a link within the document redirects to known malicious infrastructure at 'https://ttraff.cc/wb?keyword=automotive%20service%20manuals%20online'. The ML classifier also 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/wb?keyword=automotive%20service%20manuals%20online
    • http://files.shopbohosouth.com/uploads/1/3/0/7/130775551/midawepukake.pdf
    • http://files.dissmathstutor.co.uk/uploads/1/3/1/3/131383921/kizej.pdf
    • http://terevukab.perfectskinllc.com/uploads/1/3/0/9/130969559/feronafaperazi.pdf
    • http://files.archangelhumandevelopment.net/uploads/1/3/2/6/132680905/rujogoxenal-kodiwugejiw-rigewa.pdf
    • https://cdn.shopify.com/s/files/1/0440/1646/8133/files/django_secret_key_generator.pdf
    • https://cdn.shopify.com/s/files/1/0433/7863/8999/files/nba_2k13_cheats_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/texes_preparation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5715/files/rikelujesitefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2702/9400/files/pdf_to_word_converter_free_download_software_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5404/files/browning_prosteel_safe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6381/2002/files/91162491845.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/8086_assembly_language_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/8625/6030/files/exploring_public_relations_global_strategic_communication.pdf
    • https://cdn.shopify.com/s/files/1/0431/6558/1468/files/expanded_psionic_handbook_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/nizet.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/riwufimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6737/5777/files/jefajiferigobad.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_off00005f97.bin
354eed2684e92d2da915dbcab596b7af8c490b904ff8fdaf2fdf35ef0ea48563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F97 4992 bytes
font_01_sfnt_off0000707d.bin
bd308de58c8f9db3d2e3e5ee4e321e47ec4372345aedb53594e6857fe4984619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707D 10092 bytes

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