Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d02a7402ce31ea1…

MALICIOUS

PDF

33.4 KB Created: 2020-07-12 05:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 134ec3b14e6f5691dc1b0c17ac099ad9 SHA-1: 89f83a899d0aa647da41797081df8ce7dc32097d SHA-256: 3d02a7402ce31ea1f540e809ebacaa24c02e040c6be292cb2dad5a609c216b01
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains a URL that appears to be a lure for educational content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves tricking the user into clicking a link that leads to a malicious site.

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.com/wb?keyword=geometry%20worksheet%201.3%20distance%20and%20midpoints%20key
    • http://files.sossanantonio.org/uploads/1/3/2/6/132695493/wolixitija_donipemamuj_lugusifa.pdf
    • http://files.arh-editing.com/uploads/1/3/2/6/132695195/fidovekobabali_vekosefamuxelip_momofajiniwi.pdf
    • http://files.nducuwangugi.com/uploads/1/3/0/9/130969555/gimuviri-megatanizus-selusifo.pdf
    • http://files.portlandraindance.com/uploads/1/3/1/4/131483154/tidax_juwifu.pdf
    • http://files.sjkim-tkd.com/uploads/1/3/1/4/131453560/2928228.pdf
    • http://files.trinityepiscopalmarshall.org/uploads/1/3/0/7/130775150/7815968.pdf
    • http://files.breedingforthefuture.com/uploads/1/3/2/6/132681566/sutavumuz.pdf
    • http://files.jonmose.com/uploads/1/3/1/3/131383747/tilawa-dolexi.pdf
    • https://kodelemepopi.files.wordpress.com/2020/06/98507955177.pdf
    • https://kewiwil.files.wordpress.com/2020/07/63668818684.pdf
    • https://porawinag.files.wordpress.com/2020/06/panefibopikagexenupisaxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76423385748.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/31141997970.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/87369234032.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/32570896409.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/buvuzizesanelura.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046a4.bin
53dbbc392e0ac3c676e18e84466139c64b28b584d8f955d5559ba02d5c7718de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46A4 5608 bytes
font_01_sfnt_off000059b3.bin
f84f184729415031ce2252e907793a71db56290f71641fe53c0d5b3c57c85085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B3 8952 bytes

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