Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb053e4c7b83109e…

MALICIOUS

PDF

45.5 KB Created: 2020-08-20 13:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c904e289ef7ad19da4545d2d2938f0f2 SHA-1: a5cb2a61f1a32e70e063ccd5ef7b34c45e97e991 SHA-256: fb053e4c7b83109e6cb9075a2590d5495df84c6a860eddfcb3310203d8cb2499
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 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 various domains. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is used to obscure the final destination. The document body, though partially corrupted, contains the phrase 'hydroxychloroquine davis drug guide pdf' and the malicious redirector URL, suggesting a lure to potentially malicious content disguised as a drug guide. No scripts were extracted from this sample.

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=hydroxychloroquine+davis+drug+guide+pdf
    • http://files.ohanahomeschool.org/uploads/1/3/2/6/132681812/ca840e669564359.pdf
    • http://pudulezuj.graphiclibrary.org/uploads/1/3/1/4/131437318/mevujodufilew_sefevuno_bosubunulun.pdf
    • http://files.tributegiftsgp.com/uploads/1/3/0/8/130814205/b87bd3f1c.pdf
    • http://files.thundapaw.com/uploads/1/3/1/4/131453226/zenanopelolo.pdf
    • http://xudujom.stthomasabecketchurch.co.uk/uploads/1/3/0/7/130776089/bikomup-jelobibulamit-xifubogibedimo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/sajuneworotezebuvobo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/jagurobiwipisobotivib.pdf
    • https://cdn.shopify.com/s/files/1/0431/3333/7768/files/laxoripota.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/62227320477.pdf
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/moxokotaliruwujitamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7107/7542/files/ruptura_de_aneurisma_de_aorta_abdominal.pdf
    • https://cdn.shopify.com/s/files/1/0436/4517/3910/files/luxusituper.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/vaxezuvefagoguv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2533/files/unchain_my_heart_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0438/7792/5019/files/xetofufekilati.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/momiwobibatowize.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073f9.bin
b98ff8174461da868a0d41a1f66f51a96314db2f92022fd025e15411b9659278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F9 5736 bytes
font_01_sfnt_off0000877b.bin
aed8a4c3c70c53578ed38fbd6c60c3db13064cbb6da41ca0fef59a48479f8484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877B 9880 bytes

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