Malicious PDF — malware analysis report

Static analysis result for SHA-256 639a2447938c3875…

MALICIOUS

PDF

38.8 KB Created: 2020-08-26 07:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc87b644564541fb69fe5ac0f5457a07 SHA-1: cc865e1e74ab963b125b29f6b9fc1f86652754fe SHA-256: 639a2447938c38751f89be05df589fb4c04884b9051c32836dba10d5eb2008f3
202 Risk Score

Malware Insights

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

This PDF contains a critical heuristic indicating it links to malicious redirector infrastructure, specifically pointing to a download for 'gta+sa+camhack+dx8vb.dll'. The document also contains a lure to execute commands via the clipboard, likely to facilitate the download and execution of the payload. The presence of numerous external links, many pointing to benign Shopify PDFs, suggests a link farm used to obscure the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/pify?keyword=gta+sa+camhack+dx8vb.dll+download
    • http://files.lakoniaultrarunning.com/uploads/1/3/2/8/132815154/95784780a18.pdf
    • http://ledifaro.simplycreativetreasures.com/uploads/1/3/1/6/131606271/25a91937a.pdf
    • http://files.myplanetink.com/uploads/1/3/1/1/131164476/7200166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/9958/4664/files/ap_polycet_allotment_order_2016_manabadi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/jisoma.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9259/files/important_vocabulary_for_ielts.pdf
    • https://cdn.shopify.com/s/files/1/0433/7503/4520/files/73499944347.pdf
    • https://cdn.shopify.com/s/files/1/0428/2590/8383/files/67248469917.pdf
    • https://cdn.shopify.com/s/files/1/0435/1285/6731/files/minecraft_custom_world_presets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sovir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/56669421981.pdf
    • https://cdn.shopify.com/s/files/1/0437/5874/7800/files/valkyrie_profile_walkthrough_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005814.bin
bc3ce91587958183c4d3fbebf45fb2603ce88b258f73bc7685e3224fa953df74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5814 5764 bytes
font_01_sfnt_off00006baa.bin
9aa912a6fed283314a52806d4e16a08d5a1d31ffab1d03e384465ea0e3a3acf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BAA 10280 bytes

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