Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b64cd2195098382…

MALICIOUS

PDF

50.9 KB Created: 2020-09-01 03:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8486edd6222c7520aa726076adb1060 SHA-1: ce988aa68e6d2a19cc620f980e45ec65d728338c SHA-256: 5b64cd2195098382f0fd05b9ca5d8d9c9269293f60b38fc151ac853fc844aa54
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO spam operation. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com', which is used in conjunction with a search query related to a popular game. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to the mass of external links.

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.com/wix?keyword=beyblade+v+force+game+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2144/2965/files/2343130905.pdf
    • https://cdn.shopify.com/s/files/1/0435/8511/0177/files/presentation_speech_script.pdf
    • https://cdn.shopify.com/s/files/1/0434/0164/2135/files/tovitigis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/juzimivewamuwaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/49235927198.pdf
    • https://cdn.shopify.com/s/files/1/0439/2134/2619/files/mexapimanazabaluzu.pdf
    • https://static.usrfiles.com/ugd/b8c837_d1b07e5cc80f421399e748d3e082ab2a.pdf
    • https://static.usrfiles.com/ugd/b8c837_eef65faab57c451da30947b4172d077f.pdf
    • https://static.usrfiles.com/ugd/b8c837_16d40a386dc844cdb4fc434921724c2d.pdf
    • https://static.usrfiles.com/ugd/a4e402_8994330e81d54512a2c0bb61ab117f8d.pdf
    • https://cdn.shopify.com/s/files/1/0434/3005/2007/files/cctv_camera_proposal.pdf
    • https://cdn.shopify.com/s/files/1/0447/5315/8298/files/vavupudiwimuvisanixovava.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vunazazaxukatokezidabu.pdf
    • https://cdn.shopify.com/s/files/1/0439/0843/2040/files/26325882297.pdf
    • https://cdn.shopify.com/s/files/1/0432/3062/5950/files/wavezu.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_off00007509.bin
f0e1b11d33d9af4638ea06d01a3b8f63196b36db157b642064e962d4eedbca9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7509 4876 bytes
font_01_sfnt_off000085fc.bin
3a35702b44ae7f8e6217eecd9d6f472558aa1f47e0ebba4bbab32514bd8ad468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FC 5512 bytes
font_02_sfnt_off000098bf.bin
d4b7f41491eed18f5e1c311eb3996a7d763ccbc6e28bb08f8708746bd3bf1810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98BF 10484 bytes

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