Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cb153881b0ebf9…

MALICIOUS

PDF

44.4 KB Created: 2020-08-12 01:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 929fd020a44a0ac3bc12db99cfefb4d7 SHA-1: 2e95311e864c776efa56906f72c5b3f17fd34724 SHA-256: b9cb153881b0ebf93445bce6dafec16132aff18f6765f94aaa9de5a47cc40433
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The heuristic firings indicate this is likely part of an SEO poisoning or link farm strategy to drive traffic to malicious infrastructure. The document body itself is heavily obfuscated and contains the primary malicious URL.

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.ru/pify?keyword=prontuario+cemento+armato+santarella+pdf
    • http://files.tedxparkcity.org/uploads/1/3/1/8/131857544/napekizi-getubi-wijavomelonuna.pdf
    • http://files.tweedvalleyhapkido.com/uploads/1/3/0/7/130739776/68e80.pdf
    • http://files.speedwayandroadracehistory.com/uploads/1/3/1/4/131407952/7376293.pdf
    • https://cdn.shopify.com/s/files/1/0429/8784/7843/files/momotoxixalilosisafo.pdf
    • https://cdn.shopify.com/s/files/1/0439/7232/9630/files/tove_lo_habits_remix.pdf
    • https://cdn.shopify.com/s/files/1/0430/0262/6202/files/nokuwasagoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/bossypants_tina_fey.pdf
    • https://cdn.shopify.com/s/files/1/0430/2602/2557/files/66232714835.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/dotuledidapaxobaneruruge.pdf
    • https://cdn.shopify.com/s/files/1/0429/4295/5687/files/wumibufokepibofenabej.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/64730635909.pdf
    • https://cdn.shopify.com/s/files/1/0438/5406/9925/files/46921974164.pdf
    • https://cdn.shopify.com/s/files/1/0436/6820/9817/files/architectural_lighting_designing_with_light_and_space.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006248.bin
3e2d9431389380c83d5b0e10c9da3b40ea00d0f176e878e511a60990f0ae0002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6248 5184 bytes
font_01_sfnt_off000073cd.bin
c28809329d5ace8af73a2c701ee372c089c5ad4c6c0855da881cb205bcdbf281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CD 10724 bytes
font_02_sfnt_off000096ce.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96CE 4324 bytes

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