Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fd5257267b90bb…

MALICIOUS

PDF

31.0 KB Created: 2020-08-18 14:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 837e396d2b4754f082c0508af1f4e5b1 SHA-1: e135cf0c28397295ee7d1c2accce75183322e906 SHA-256: d0fd5257267b90bb4fdb69d4f411018fe6f7a309de16d11632b9c4605ccc4fbc
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple embedded links, with one heuristic specifically flagging it as a malicious redirector. The document body, though partially corrupted, contains text related to an 'Igcse biology edexcel revision guide' and includes the suspicious URL. This suggests a social engineering tactic to lure users into clicking the link, likely leading to a malicious download or phishing page. The presence of numerous external PDF links, many hosted on Shopify, further supports the 'link farm' heuristic, indicating an attempt to manipulate search engine results or distribute content through seemingly legitimate platforms.

Heuristics 3

  • 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.
  • 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=igcse+biology+edexcel+revision+guide
    • http://files.pro-help.co.uk/uploads/1/3/1/3/131380343/vupin.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/jetamoferi.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/74071906772.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3323/files/cash_drawer_count_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/pigetojekefoponixazijix.pdf
    • https://cdn.shopify.com/s/files/1/0437/9531/6896/files/cafeland_hile_apk_1._8._5.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/41282487004.pdf
    • https://cdn.shopify.com/s/files/1/0452/5775/2733/files/cognitive_psychology_journal_articles.pdf
    • https://cdn.shopify.com/s/files/1/0429/1841/2451/files/spss_survival_manual_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/1016/2837/files/kisuvelon.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_off00003e87.bin
a62919217c2897aa95e7a7968e87ad68f2a160f3955e7761cde58df391b72f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3E87 5204 bytes
font_01_sfnt_off0000504a.bin
21f99137579385f4441cd9762d4933d114f173b3316b8e1c273c1c33e28cf286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x504A 9124 bytes

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