Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ae0707f346e35e…

MALICIOUS

PDF

37.8 KB Created: 2020-08-11 17:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0dc53dd14585621c832e49bff46f2c4 SHA-1: e38bf627f9bf424d73a02d85e8419c6ade421a37 SHA-256: b1ae0707f346e35ec2733f8d98f65dcc5fea7f3f6e24547f939c3702c7c8c876
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is an 'answer sheet pdf free' and includes the malicious redirector URL. This indicates a social engineering lure to drive traffic to malicious infrastructure.

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.
  • 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
  • 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=answer+sheet+pdf+free
    • http://files.rollepodiatry.co.uk/uploads/1/3/1/3/131382274/326971ba673848.pdf
    • http://files.cvhsmusicals.org/uploads/1/3/0/7/130739154/vuvumuk-luroseb-furagefur-megufulipaj.pdf
    • http://files.thematic-learning.org/uploads/1/3/0/7/130739625/344659459.pdf
    • http://files.debbieclaxton.co.uk/uploads/1/3/0/7/130740363/7e80d2ea8.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/88886314607.pdf
    • https://cdn.shopify.com/s/files/1/0431/2858/6402/files/33082952565.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/merosiletulomefil.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0381/files/absceso_apical.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5499/files/20474615007.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/sulaniriwig.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2554/files/38650374951.pdf
    • https://cdn.shopify.com/s/files/1/0430/2441/6931/files/40352979946.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39806276645.pdf
    • https://cdn.shopify.com/s/files/1/0434/7654/9798/files/90116415838.pdf
    • https://cdn.shopify.com/s/files/1/0435/8841/9741/files/11767661511.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_off000056e1.bin
6e28c63954ac670113e49f580e9319be6436efb79994de187388d7f53efc4878		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56E1 4968 bytes
font_01_sfnt_off000067d5.bin
792e640854b3b5637f4757d01f603ca8f0a30827116a0d699b2862310bdfb5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D5 10164 bytes

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