Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00fd6166bdb2060…

MALICIOUS

PDF

119.7 KB Created: 2020-08-04 03:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0eafa4e2afbeaa980dac8f9a617577ff SHA-1: 2b20ebc244ac1c1376b38b9de550bc561a574fd3 SHA-256: d00fd6166bdb2060252bb9b810fd1d2f9843592a37871a5b8be5bd0dca6acd3a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on platforms like Shopify. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a link farm, and the presence of a malicious redirector URL ('https://ttraff.ru/pify?keyword=epigenetics+dr+joel+wallach+pdf') suggests a malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be largely obfuscated or corrupted, but the presence of the malicious URL within it reinforces the attack pattern.

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=epigenetics+dr+joel+wallach+pdf
    • http://files.therazorandshear.com/uploads/1/3/1/0/131071117/33f9b9d66c8.pdf
    • http://files.dodoskinblog.com/uploads/1/3/1/3/131379792/4635304.pdf
    • http://files.whitkoband.com/uploads/1/3/1/4/131407647/3389198.pdf
    • http://files.thewinfrey4.com/uploads/1/3/2/3/132303219/gurajuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/xawirudosufenosopifefip.pdf
    • https://cdn.shopify.com/s/files/1/0432/5811/8312/files/wukipejetobowega.pdf
    • https://cdn.shopify.com/s/files/1/0433/7411/7015/files/gatowaduf.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/tumbalalaika_sheet_music_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/kosemizeferepanegopan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6577/8080/files/biliwerelizawidijaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xewujixamugovaginebutomo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/57394160510.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/gidukulojizoruxilipen.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0497/files/60958170509.pdf
    • https://cdn.shopify.com/s/files/1/0432/1338/9992/files/tikarujusomagamagisisivas.pdf
    • https://cdn.shopify.com/s/files/1/0440/9799/4904/files/84737050153.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/sudexerugazat.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_off00018379.bin
caec7e43f85f985994280070ba18d26fd7066667d29fc8116b8241e300aec76d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18379 5332 bytes
font_01_sfnt_off000195a8.bin
8649b72d01c64efef7c3f2a0e2e64f22085e22abf295c9687e99640cf0f06e05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x195A8 14380 bytes
font_02_sfnt_off0001c2f6.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2F6 4324 bytes

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