Malicious PDF — malware analysis report

Static analysis result for SHA-256 0485c5cc911b177b…

MALICIOUS

PDF

44.4 KB Created: 2020-08-25 03:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8394638cb1d319633130c4aaa90a875 SHA-1: 1ad833ae7318d940553787118666a40bfa8c9d99 SHA-256: 0485c5cc911b177b80696fd053e168b9af24ac5be725221f3757c04040a991d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to a "cheat sheet" and includes the primary malicious URL. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to drive traffic to malicious sites.

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.ru/pify?keyword=cheat+sheet+for+word+chums
    • http://xuralo.38plus2productions.com/uploads/1/3/1/3/131398177/nejuwisugobad.pdf
    • http://files.thefishinprison.com/uploads/1/3/2/8/132815003/jozolupofojagi.pdf
    • http://ruruzube.mathsphysicshub.com/uploads/1/3/0/8/130874474/bf7380dccf5.pdf
    • http://files.mtbsiteservicesbusiness.com/uploads/1/3/0/9/130969002/c4babc65b1fcc0.pdf
    • http://files.smisekfamilydentistry.com/uploads/1/3/0/9/130969614/vikagakejaku-fefogekanika-vodowelebavul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8029/4306/files/samsung_software_update_tool_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/0940/1254/files/short_story_in_english_audio.pdf
    • https://cdn.shopify.com/s/files/1/0434/1006/3527/files/47384519380.pdf
    • https://cdn.shopify.com/s/files/1/0434/7143/7984/files/fidot.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5293/files/rulavowiven.pdf
    • https://cdn.shopify.com/s/files/1/0436/4946/6526/files/digital_communication_proakis.pdf
    • https://cdn.shopify.com/s/files/1/0432/4704/2715/files/nazozak.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/mesapixowekos.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6268/files/xakubovivu.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/70852354730.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1413/files/aws_iam_role_policy_cloudformation.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_off00006d87.bin
acf92acb13b2a964f3a28dca077ef18ab3f5ad618d948ddfe53a82f980409c27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D87 5228 bytes
font_01_sfnt_off00007f3b.bin
d1030d5f4b2ab1922c0c1c6aa9f10e7e3810a9cfea1b6a918b8e63ded0f59251		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3B 11176 bytes

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