Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f05d54e0a21ed84…

MALICIOUS

PDF

67.6 KB Created: 2020-08-06 23:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6c22199796c26566663e7bbe72d3e5f SHA-1: 77431832e2e6f97d7a61fdb81439970c756de3c7 SHA-256: 6f05d54e0a21ed8448cff26e25520c4a5e32d2b9c6b6fd6f3e2f6d675cf6325d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to host numerous PDF files. One of the primary links directs to a known malicious redirector infrastructure, suggesting an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains text related to a calculus textbook and the malicious URL, reinforcing the lure.

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=calculus+early+transcendental+functions+larson+6th+edition+pdf
    • http://files.romainewashington.com/uploads/1/3/1/8/131857193/ropodefi.pdf
    • http://files.maryjoyceart.com/uploads/1/3/1/3/131379567/sojow.pdf
    • http://files.amandacasale.com/uploads/1/3/1/8/131871740/8872462.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/86184412205.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/bilatagotu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3208/3612/files/gta_san_andreas_hot_coffe_mod.pdf
    • https://cdn.shopify.com/s/files/1/0434/6413/0710/files/ignou_bcom_syllabus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6343/files/vikunifovapopibijo.pdf
    • https://cdn.shopify.com/s/files/1/0434/6350/8121/files/97637545471.pdf
    • https://cdn.shopify.com/s/files/1/0432/8403/7792/files/copy_certification_by_document_custodian.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/entrepreneurship_development_programme.pdf
    • https://cdn.shopify.com/s/files/1/0431/8511/1203/files/7223913054.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/49688263658.pdf
    • https://cdn.shopify.com/s/files/1/0435/0047/0438/files/problem_solving_and_decision_making_skills.pdf
    • https://cdn.shopify.com/s/files/1/0435/6653/0719/files/pujepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/bibazoparelusaxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/46708541798.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af4c.bin
0c0fc3b0864f490968a1dfe6a0fbea98f31df26fd910dc552ba7258d7cafaca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4C 5404 bytes
font_01_sfnt_off0000c1ae.bin
c008eb90aaf822cdeecfc16462b47c25a6191e4443d5393a7ad09e432f76e215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 14996 bytes
font_02_sfnt_off0000f0b9.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 4324 bytes

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