Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cd1a78b32db469…

MALICIOUS

PDF

35.9 KB Created: 2020-08-12 23:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cde12d9242fcc4c58c7e92dac89b23ad SHA-1: 78783415ba402f05e2e37bc918fd2df4091457a9 SHA-256: 07cd1a78b32db469da3c9c40d56e00aaa19523703b8b466473219bfaded28ca0
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a worksheet download, which redirects to a known malicious domain. The ML classifier strongly indicates maliciousness, and the presence of numerous external links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to host malicious content. No scripts were extracted, but the primary attack vector is the malicious redirector.

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.com/pify?keyword=abstract+and+concrete+nouns+worksheets+for+grade+4+pdf
    • http://rururuviv.biglittlebrains.com/uploads/1/3/1/4/131437987/muwibefajokotaz_binukelabufud.pdf
    • http://files.polesworthpoetrytrail.org/uploads/1/3/1/4/131438776/kugizoribati.pdf
    • http://files.kkstechtips.com/uploads/1/3/2/6/132683484/lodusipawuneva-rotafivuwexil-mekopegagopumak.pdf
    • http://files.rivalgates.com/uploads/1/3/0/7/130739204/452accfd156.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/jusisaposokimerufobarupe.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/wopekupalutuwibeluxojoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/6992/2714/files/50839403431.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3800/files/gosejalemi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0965/5462/files/23444406572.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6975/files/atar_notes_legal_studies.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/nepupexojobufadazexur.pdf
    • https://cdn.shopify.com/s/files/1/0439/9972/3678/files/begutimadexadufotojugojid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/lopisixidominiwapozex.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/ansi_z535_safety_color_chart.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/46826630700.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/53625605356.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_off00004d2e.bin
fd921d5a23c8a9a5f625cb77cfdabdd0f5d265ecc8cf4e0de52f93365eed78a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D2E 5756 bytes
font_01_sfnt_off000060d0.bin
e5240a97a75b7d04cd07c794e35e47064ec4b682b327fdb21537415e5af2bd2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D0 9852 bytes

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