Malicious PDF — malware analysis report

Static analysis result for SHA-256 8827df04bb818e38…

MALICIOUS

PDF

43.6 KB Created: 2020-08-28 03:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d2509a6f6eccc78e2d504f07423db79 SHA-1: 2164d23c2a91f5632e7c45048421fe404071d13d SHA-256: 8827df04bb818e388fcb74f3efa73d3ae90500b828113ae58c4977b5a6930936
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. A critical heuristic indicates the document attempts to lure the user into executing commands via the clipboard, suggesting an attempt to download and run a second-stage payload. The presence of multiple Shopify-hosted PDFs and a redirector URL points towards a link farm or phishing campaign.

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.ru/pify?keyword=heroclix+dial+maker
    • http://files.silverchain-us.com/uploads/1/3/0/8/130874317/lisuda.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/5621/5702/files/43413604033.pdf
    • https://cdn.shopify.com/s/files/1/0446/6668/3545/files/gukibogeve.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/49181475687.pdf
    • https://cdn.shopify.com/s/files/1/0461/5392/4771/files/refimawiduvatuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/7437/8142/files/autocad_estudante_autodesk.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/pagalworld_english_songs_2017.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9703/files/92167235036.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/telenigasiluxalowo.pdf
    • https://cdn.shopify.com/s/files/1/0450/2568/9758/files/slaying_excel_dragons.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3257/files/calculus_art_of_problem_solving.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/1083378924.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000604d.bin
999d8ea18d71da986acc2749382c8dea17bf29faf7d77bc47cb99548e9abd4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604D 4604 bytes
font_01_sfnt_off00006fe0.bin
d8b916b829caadd452cdd40a2afbf05a01d5ba1f862b2f0153a997f35dd3185c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE0 10480 bytes
font_02_sfnt_off000093bd.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93BD 4324 bytes

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