Malicious PDF — malware analysis report

Static analysis result for SHA-256 77624708f7bc5f84…

MALICIOUS

PDF

44.7 KB Created: 2020-09-10 02:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a6cd8787c868d51c3e4dd5fff7479e SHA-1: 0af7351bc1072d9044b03b98d38af729bce3588c SHA-256: 77624708f7bc5f84652c825144383a217219896a1d6d9fe5653c2df7f2274fd2
162 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of embedded links, suggesting a link farm or phishing attempt. The document body contains urgency lures like 'account will be terminated' and the primary malicious URL is a redirector. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lead the user to a phishing site or download further malware.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.link/wix?keyword=gmail+messenger+windows+7
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/custom_cheer_uniforms_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1125/files/zadefijifosoletopilifofow.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/basusuxoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1253/files/95980895863.pdf
    • https://cdn.shopify.com/s/files/1/0439/0807/1576/files/angielski_w_tumaczeniach_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0463/5970/7803/files/total_war_attila_ere_guide.pdf
    • https://static.usrfiles.com/ugd/7baf93_270fdd44ceef4af5b3c42007bbf05119.pdf
    • https://static.usrfiles.com/ugd/9904c2_1fd68ab0ade844369c81a3456e3d8722.pdf
    • https://static.usrfiles.com/ugd/b8c837_fb081d87cd404d79988cd52e389d41e2.pdf
    • https://static.usrfiles.com/ugd/93c935_6ba4607ffb6541b1bedd8c813cc327ef.pdf
    • https://static.usrfiles.com/ugd/1e32c2_a93f4453fdd84b5d93f3203f544234dd.pdf
    • https://static.usrfiles.com/ugd/a91264_d96bd814f3734973994a88ea96898227.pdf
    • https://static.usrfiles.com/ugd/b916f4_61c23f73b10f4a55899fed91e712d41c.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_off0000709b.bin
90f172070bb6648237901e1e25bcf8ba240d291500ea6fdcec9ffdcaf5b319e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709B 5348 bytes
font_01_sfnt_off000082c8.bin
c017a36b8ff6eed49085423382acf8f19c3281bf24a5815923cdeb6fd2d7b2f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82C8 10492 bytes

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