Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6e5a633eb9e527…

MALICIOUS

PDF

61.0 KB Created: 2020-08-21 04:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db67f399df9462d4ed21e61fc9d97c10 SHA-1: 057b767a4594a8673fcb472ab4919ccae8dbc587 SHA-256: be6e5a633eb9e5270c73de4b581a7e73076fbe05cb2435b7a8a1c822fe561a4b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains embedded links that lead to a redirector URL, which is indicative of a phishing or malware distribution attempt. The document body, though partially corrupted, suggests a lure related to a 'blood test report for fever'. The presence of numerous external PDF links, many hosted on Shopify, further supports the malicious intent of creating a link farm for SEO manipulation or to obscure the true destination. The ML classifier 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=blood+test+report+for+fever
    • http://files.eastsuburbanconnect.com/uploads/1/3/0/9/130968947/8fec3a.pdf
    • http://lidukuje.sustainableetc.com/uploads/1/3/0/7/130776031/8888030.pdf
    • http://files.demornewarrenddub.com/uploads/1/3/1/4/131409170/dakodup-simegi.pdf
    • http://wosozebe.procure-ico.eu/uploads/1/3/0/7/130775612/rexedi-salorifulez.pdf
    • https://cdn.shopify.com/s/files/1/0432/2898/7547/files/98825848665.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/nosiguxutawowo.pdf
    • https://cdn.shopify.com/s/files/1/0450/9194/6661/files/string_concatenation_c.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/49405596429.pdf
    • https://cdn.shopify.com/s/files/1/0436/8649/4361/files/ukulele_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/6107/6387/files/pivuri.pdf
    • https://cdn.shopify.com/s/files/1/0437/4301/9159/files/bubble_sheet_lahore_board.pdf
    • https://cdn.shopify.com/s/files/1/0432/4468/3432/files/vinokojamifafusajeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0463/3044/5981/files/bajrangi_bhaijaan_film_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/0076/6369/files/32270205219.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089cc.bin
0d4e6248c5fb1f433e848d8f28113b421affdbd2d55051c247412e712d021fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CC 4568 bytes
font_01_sfnt_off00009975.bin
dcf871e19ce46af380d5b01651ca857db62264c8c0cb119944b7cb4289f02ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9975 13196 bytes
font_02_sfnt_off0000c414.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC414 16060 bytes
font_03_sfnt_off0000d8ab.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 4324 bytes

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