Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bc7d468f2b7e39…

MALICIOUS

PDF

45.9 KB Created: 2020-08-08 15:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b390d22959d77570027836fc339a3b0e SHA-1: 55dda32f2ff9d07b9cf974ddf9e6dbe6e8da10f1 SHA-256: 71bc7d468f2b7e397432e2ee2a187d8bc54327a8d1d351d1f1de7dece013fe08
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'phonics worksheets pdf uk' and the malicious URL, suggesting a lure for SEO spam or phishing. The presence of many external PDF links further indicates link farm activity.

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/pify?keyword=phonics+worksheets+pdf+uk
    • http://files.uilmusicregion12.com/uploads/1/3/2/6/132682585/1394178.pdf
    • http://files.ericaevansartist.com/uploads/1/3/1/3/131398281/1197094.pdf
    • http://files.friendsofpns.org/uploads/1/3/1/4/131455337/b0581.pdf
    • http://juromibu.share-the-joy-orillia.ca/uploads/1/3/2/7/132740405/c0a4f2df8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6074/6648/files/remove_watermark_adobe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4306/1913/files/47607564726.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/37955718641.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89709194360.pdf
    • https://cdn.shopify.com/s/files/1/0450/0137/5912/files/download_ayyappa_bhajan_songs_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5341/6601/files/emerson_ovation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2350/6336/files/wikamusimubepig.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/descent_into_avernus_trove.pdf
    • https://cdn.shopify.com/s/files/1/0434/6403/2422/files/5209847388.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0055/files/panama_city_beach_water_temp.pdf
    • https://cdn.shopify.com/s/files/1/0431/1154/7037/files/jibefuzatetotazowobub.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/sebawezi.pdf
    • https://cdn.shopify.com/s/files/1/0435/3720/3364/files/d_d_champions_of_ruin.pdf
    • https://cdn.shopify.com/s/files/1/0434/9332/7008/files/1780671505.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_off0000761d.bin
893404a53743d82e7e5cfe1a5e4e8a4cc9ccf7e08b415599372084d44d6728a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761D 5156 bytes
font_01_sfnt_off000087bb.bin
54a7df9bcb3b01366a6ed41d262c3f9b1730800eaf5f1f64fef1570eb14d4a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87BB 10196 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.