Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd9051791f65558…

MALICIOUS

PDF

46.6 KB Created: 2020-08-11 20:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 555f122a3981ec60e279496255acf103 SHA-1: d21ae0ee4c2cd0820ae0411f838b1eec9bf3fbc8 SHA-256: 6bd9051791f6555867e44cc49fd86685c179e39b0dfa1fd311de6515b1baf168
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to drive traffic to potentially harmful content. The document body, though heavily obfuscated, contains the malicious URL and references to guitar chords, suggesting a lure. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=basic+guitar+chords+for+beginners+acoustic+pdf
    • http://files.houseofdiamondsphxdior.com/uploads/1/3/1/4/131453429/tetupuko-nomede-duvezuzusiximun-nizuxunikovos.pdf
    • http://files.kretzmerconsulting.com/uploads/1/3/1/4/131483143/1669131.pdf
    • http://zozupire.masshurricanes.com/uploads/1/3/1/0/131069934/7278838.pdf
    • http://files.johnsonwriter.com/uploads/1/3/1/4/131453151/8866908.pdf
    • http://gufeka.fablegroundscoffee.com/uploads/1/3/1/8/131856907/poduvufi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/16729524199.pdf
    • https://cdn.shopify.com/s/files/1/0434/6904/5926/files/relative_clauses_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2335/files/82493680582.pdf
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/genufajewiwes.pdf
    • https://cdn.shopify.com/s/files/1/0438/0491/7917/files/binding_of_isaac_godmode_wiki.pdf
    • https://cdn.shopify.com/s/files/1/0430/7759/9383/files/ledisusotasopiwegeguki.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/the_official_comptia_cysa_study_guide_exam_cs0_001.pdf
    • https://cdn.shopify.com/s/files/1/0437/8250/4600/files/present_tenses_exercises_intermediate.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/27127474212.pdf
    • https://cdn.shopify.com/s/files/1/0432/1237/4174/files/92234151741.pdf
    • https://cdn.shopify.com/s/files/1/0436/6086/9785/files/convert_characteristic_function_to.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_off00006f13.bin
a944eb4fdb19185180cb8994ac12de209b62573107da1212b276083e35f793af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F13 5576 bytes
font_01_sfnt_off000081ed.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81ED 1800 bytes
font_02_sfnt_off00008a7a.bin
b5e9be2d7bef9facd9f2b3d7679660813d0a2762f729f0302690cae585380597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A7A 10032 bytes

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