Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd42bc0934655d9…

MALICIOUS

PDF

40.7 KB Created: 2020-08-22 22:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e180c362179fd180120dd262d0d1e14 SHA-1: 685a1d2742dcb22b05f60f3d6108bc017b485571 SHA-256: 6bd42bc0934655d99b33371f5fb517441ecd32ed49eb69923d6e474274130639
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=oh+ms+believer+piano+sheet+music+free'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. The document body, though heavily obfuscated, also contains the malicious URL.

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.com/pify?keyword=oh+ms+believer+piano+sheet+music+free
    • http://files.creeksidepto.com/uploads/1/3/0/8/130873839/roxejimoj-tewupipugabokor-nulurigedagi-zaxakegar.pdf
    • http://tefikosuf.terenceyoungnow.com/uploads/1/3/2/7/132741198/6104971.pdf
    • http://files.ahellishplaceofangels.com/uploads/1/3/0/8/130813966/kubam.pdf
    • http://files.badbudcbd.com/uploads/1/3/0/7/130738667/6515fe59d307.pdf
    • http://files.silkenfest2017.com/uploads/1/3/1/3/131383342/00507d6f2a50.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/9845/4682/files/rejegud.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/99095983319.pdf
    • https://cdn.shopify.com/s/files/1/0434/2690/6264/files/accountancy_project_for_class_12_with_gst.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0449/2584/5659/files/sony_cdp-_cx355_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3935/files/zajinawotifexidej.pdf
    • https://cdn.shopify.com/s/files/1/0433/8361/9736/files/xuzobo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/behind_enemy_lines_colombia.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/top_10_android_games_2019_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/bexipupomitoladofa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/lozenatuto.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/fisiopatologia_de_la_cirrosis_hepatica.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/wapefofuk.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_off00004bfe.bin
6802b5713e1ed12468ebf5e0da44de14e1dc85d48aa2e47eaefca77803ee1fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BFE 5364 bytes
font_01_sfnt_off00005e14.bin
907a53919ac7370fe38e1e2221da1f5687116d874a3b1b231e975ba0fe322d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E14 12580 bytes
font_02_sfnt_off0000853f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x853F 4324 bytes

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