Malicious PDF — malware analysis report

Static analysis result for SHA-256 149fd5c3ac946dea…

MALICIOUS

PDF

40.4 KB Created: 2020-08-06 21:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 469bbd2f14ca09c9eae76d3152ececaa SHA-1: 7bcdd0d4d363af73d5b88e9bba07dc85d073963e SHA-256: 149fd5c3ac946dea99206acc95e3af4b71b499a522cdcd38209ef673d5ff78bd
162 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to potentially malicious redirectors, and includes a visual download button lure. The document body, though heavily obfuscated, contains text suggesting a download prompt for a school agenda, which is likely a pretext to encourage clicks on the malicious links. The ML classifier strongly indicates maliciousness.

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/pify?keyword=descargar+agenda+escolar+2020+pdf
    • http://files.hsc3knives.com/uploads/1/3/0/9/130969243/a00465f049b.pdf
    • http://files.bassetfriendsforever.com/uploads/1/3/1/8/131856105/9738393.pdf
    • http://files.1848concordschool.org/uploads/1/3/2/6/132695646/gotosem.pdf
    • http://files.atenaarquiteturanatural.com/uploads/1/3/1/3/131398573/pepibijozuzat.pdf
    • http://files.andrewmaxbauer.com/uploads/1/3/1/4/131453124/xeragagovumazus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4472/4133/files/6901424019.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/9972823704.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/british_and_american_accent.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7717/files/nevovatenanugidobexanuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/xadamafilorowanut.pdf
    • https://cdn.shopify.com/s/files/1/0431/2409/7191/files/81118337357.pdf
    • https://cdn.shopify.com/s/files/1/0438/2880/5789/files/tajon.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/98663735439.pdf
    • https://cdn.shopify.com/s/files/1/0431/5539/0630/files/71407137184.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/13888606798.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_off00005f07.bin
41abe8d14fbca0065030f757d483e4da2467a10bed738b504a65dc553aaab000		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F07 5596 bytes
font_01_sfnt_off0000722b.bin
d5b37ba9042ce6810a28ca092dc720dfdaa3f22516408cbdb602e4e9842bb4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722B 10184 bytes

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