Malicious PDF — malware analysis report

Static analysis result for SHA-256 027fb9c8fcbdfc60…

MALICIOUS

PDF

47.3 KB Created: 2020-08-31 01:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6dccb1caec23ab58dcb0ccbe70691a SHA-1: 3a51f5454146147821a5d5f0223d660979a09188 SHA-256: 027fb9c8fcbdfc60a75a30ec3ddd00afd4e85c773ef567ba1b1bdabe8b99e510
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a prominent link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting a lure for a 'meal plan template'. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a link farm or redirection scheme. The primary IOC is the malicious redirector URL.

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.
  • 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.cc/wix?keyword=meal+plan+template+for+clients
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3b7182_79fa599fbe624c39ae507b5d75d53ae1.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_3013244d6ce5412f9d3bc8f1cfc1ebcb.pdf
    • https://static.usrfiles.com/ugd/b85eb0_64e2e9998c3d4bc88b0665edfbd70653.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/82357017822.pdf
    • https://cdn.shopify.com/s/files/1/0437/1909/8523/files/brocade_icx_cli_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/5884/6109/files/61726854311.pdf
    • https://cdn.shopify.com/s/files/1/0431/0571/4338/files/piboxapilozobedit.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/ms_comfort_optical_mouse_3000.pdf
    • https://cdn.shopify.com/s/files/1/0428/8751/2220/files/30657506375.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/apc_full_form_in_hotel.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/forensic_files_on_netflix.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2133/files/michael_jackson_thriller_mp3_download_320kbps.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/xomolepuxisafikof.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_off000071b7.bin
26305310efd3a5e8cf435d5bafc2e6015cb477757b8c1121a3cf91b3b81f67f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B7 5168 bytes
font_01_sfnt_off0000832a.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x832A 2268 bytes
font_02_sfnt_off00008d3a.bin
ada44efbe18e1f8666d31824e3b5f1f69822688221f5975f9ccada68561f9c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3A 10328 bytes

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