Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f667d3d52e26c91…

MALICIOUS

PDF

53.5 KB Created: 2020-08-10 00:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e2df837d85eef4c83d30f88f704182 SHA-1: 5c1396c2546730de15fc5526a70ac28c3cec27a3 SHA-256: 0f667d3d52e26c919f5ec787c2dc87e575483edfa6ddaefafdb6f36dc6000dda
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a URL associated with malicious redirector infrastructure, disguised as a free download for 'Ubqari magazine april 2020 pdf'. The document also hosts a large number of external PDF links, many of which are benign Shopify links, but the primary redirector link is a critical finding. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=ubqari+magazine+april+2020+pdf+free+download
    • http://files.usedphotographyequipment.co.uk/uploads/1/3/0/7/130738971/depirilewavaban.pdf
    • http://files.freehomeschoolhighschool.com/uploads/1/3/0/7/130775557/sepinatu_nileliw.pdf
    • http://files.gaggiadirect.com/uploads/1/3/0/7/130776401/samevojaxibeme.pdf
    • http://files.ntyf.org/uploads/1/3/2/3/132302910/156081.pdf
    • http://mugibalor.arcoftheancients.com/uploads/1/3/1/4/131438405/fubos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/11836502590.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/nunagadodunewejirodud.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zozaweguxilamefawe.pdf
    • https://cdn.shopify.com/s/files/1/0448/4956/1757/files/delete_blank_page_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7319/files/how_to_make_crack_cocaine.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8798/files/jevofetotesa.pdf
    • https://cdn.shopify.com/s/files/1/0437/2958/4282/files/mepepababajokoxejip.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8231/files/43423500512.pdf
    • https://cdn.shopify.com/s/files/1/0431/1662/6082/files/81302768649.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/sodifevogapuzo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/uptet_answer_key_2020_primary_level_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4637/files/93554799734.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/a_practical_english_grammar_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051cf.bin
ffa164e902425248e1def622f3040148adbbf4c8745c85ad157d7117884b4173		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51CF 5564 bytes
font_01_sfnt_off000064a7.bin
7f3a1ef136f36ba68bc36e5bcd31de243dce7f4b60e01c4bc40f508baeb48ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A7 2604 bytes
font_02_sfnt_off00006fc3.bin
b0be8eb7aa70ae8774ce551012a4265989652c377a57f90a0c3ef29e598ef072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC3 14112 bytes
font_03_sfnt_off00009c04.bin
6e520123a2bd0e9904f95a220c02007ea320a09633fce60d08b2b586dc098bf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C04 18104 bytes
font_04_sfnt_off0000b768.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB768 4324 bytes

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