Malicious PDF — malware analysis report

Static analysis result for SHA-256 7087ffca1da87eb3…

MALICIOUS

PDF

44.0 KB Created: 2020-08-16 12:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e686f45c7ea1b4666ddbb5e3d8f46003 SHA-1: 265c9c7a2b3a848447f3381c9e40734f9d5a9116 SHA-256: 7087ffca1da87eb3c1f5d6015a73688f0f4539328d0dc86f39d477022298480e
162 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm hosted on Shopify, and one critical link to a known malicious redirector. The presence of a 'download button' lure and the ML classifier's high confidence indicate a malicious intent to redirect the user to harmful content. Although no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to distribute malware or phish for information.

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/wb?keyword=printable%20letters%20worksheets%20for%20kindergarten
    • http://tukipuped.autolandcars.ca/uploads/1/3/1/0/131069934/ff81621ce10b2.pdf
    • http://files.fhbcfortmyers.org/uploads/1/3/0/8/130874612/viloroluxaf-pironu-wupekosemobikuz-padovup.pdf
    • http://files.determinedart.org/uploads/1/3/2/6/132695388/vegopoxarid.pdf
    • http://files.learningandbehavior.org/uploads/1/3/0/9/130969054/e3cb79b62f01.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6828/3294/files/govorijapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3740/8936/files/8325886924.pdf
    • https://cdn.shopify.com/s/files/1/0429/1647/9132/files/movezuwagezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4823/files/rig_veda_bhashya.pdf
    • https://cdn.shopify.com/s/files/1/0436/7453/4041/files/present_value_of_annuity_formula.pdf
    • https://cdn.shopify.com/s/files/1/0437/2742/1608/files/ferolopenatekume.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6910/files/75840766032.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/12034669056.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tazoxusejeko.pdf
    • https://cdn.shopify.com/s/files/1/0438/2602/0509/files/28113282540.pdf
    • https://cdn.shopify.com/s/files/1/0438/0826/0258/files/52406309169.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/pafufeg.pdf
    • https://cdn.shopify.com/s/files/1/0436/0414/8382/files/42893668114.pdf
    • https://cdn.shopify.com/s/files/1/0440/0575/2997/files/automotive_repair_workshop.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_off00006e27.bin
c7508db2bbcf4af463d593f7a5828d121f3e24be4da89051fdd83e931d93665c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E27 5464 bytes
font_01_sfnt_off000080be.bin
d756e3437bae6ab3d6c6b2576f91b11d639cbf6b5d9cdd3085e55c9228b61097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80BE 9828 bytes

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