Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a1d6d2db43a212…

MALICIOUS

PDF

55.8 KB Created: 2020-08-17 05:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97e5e3c7970e5e708326f714ce6be9ca SHA-1: 846950e64c7f0a7990959532a665f4cbe1b72f0e SHA-256: 80a1d6d2db43a212ca38b01cefba254028402a97465ec20da845db664bc68d32
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The document body, though partially corrupted, suggests a lure related to 'AP Computer Science Exam Reference Sheet'. The primary IOC is the redirector URL, which is used to deliver the malicious payload. The PDF also contains a large number of external links, flagged by PDF_SEO_LINK_FARM, which is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=ap+computer+science+exam+reference+sheet
    • http://vovadima.wncflorida.com/uploads/1/3/1/3/131398367/tofevupiboke_zogox_rosufeviw.pdf
    • http://files.assortedartistries.net/uploads/1/3/1/0/131070309/1042651.pdf
    • http://files.sastinson.com/uploads/1/3/2/6/132682892/ef9ff4f42977c1.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/71709652807.pdf
    • https://cdn.shopify.com/s/files/1/0430/5630/0186/files/72436704996.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/40704800764.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/asia_map_hd_image.pdf
    • https://cdn.shopify.com/s/files/1/0431/5398/1589/files/beer_brewing_process_flow_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/57594767483.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4583/files/kixikubolobosenipilidaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/1910431803.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6645/files/mipezaselumenov.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/logitech_harmony_linux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071bc.bin
9ba0eec8489dc97dd29a99c3871f188db37a9d49f92edd45d5a32930a0e66cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71BC 5280 bytes
font_01_sfnt_off00008377.bin
80132f6efea4d476e01ea80a4fbd3e7268edd4aae6f387ebe7937c61e5c90088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8377 6304 bytes
font_02_sfnt_off000097d2.bin
6a76d594f0a9f6401041cc7dfb2012acddb79211c4e62b7a021118eb3dc4f089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97D2 10840 bytes
font_03_sfnt_off0000bcd7.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD7 16036 bytes

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