Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac25cf9f9d3a0b23…

MALICIOUS

PDF

43.6 KB Created: 2020-08-06 12:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: da4b7efc3736f60b61f5e14c1f93c3e2 SHA-1: b051ca6e74b51e06a3f9bcfa7a08f416698daa74 SHA-256: ac25cf9f9d3a0b23220e76d6df16df7bd50456c89186fac9e0fec4d019dc0502
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for 'free calligraphy alphabet practice sheets pdf' which, when clicked, leads to the malicious URL. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms a malicious intent to lead the user to a harmful 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.ru/pify?keyword=free+calligraphy+alphabet+practice+sheets+pdf In PDF document text
    • http://files.manolositalianrestaurant.com/uploads/1/3/1/4/131483148/fozifetatutuvajuka.pdfIn PDF document text
    • http://files.artofyaky.com/uploads/1/3/2/7/132712011/kowimafugekunew.pdfIn PDF document text
    • http://files.texascedarblinds.com/uploads/1/3/2/3/132303082/nusoxosaforegom_juxebabapatuni_mawirakivakixez_kaxixejowibar.pdfIn PDF document text
    • http://files.5fingersand10toes.com/uploads/1/3/1/4/131406684/buzazatulozagedig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8338/0376/files/neoliberalismo_concepto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1935/2740/files/19002772273.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/28954673548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/woribomubiwaduno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7048/8730/files/82648770163.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/telisupuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/momepavebuvomif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7180/7381/files/opera_vpn_not_working.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7519/0430/files/rikomovosukimukejato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2131/0880/files/89748743695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/xafuferaxigikaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2562/0374/files/81143483044.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8951/7973/files/vawivudozali.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B22 5616 bytes
SHA-256: 2f1771c0ca321f8bab0cefce1911e317c3156641c5b395c26860b92b99a8ea79
font_01_sfnt_off00007e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3A 10276 bytes
SHA-256: 83d091a693a30bf8a45fdaac10afc8c2407e60b8ba862f3b07a494696e7a708c

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