Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bad7bfef29835e…

MALICIOUS

PDF

52.1 KB Created: 2020-08-19 12:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1da52b4ff2047580ac558e2bb998769 SHA-1: 547e464705bee1970ead73732064ab7d5330c4c7 SHA-256: f8bad7bfef29835ecbdaf608711cf327cbcc223908dd4c172c2ace3b9dbb634c
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=3.+bundesliga+spielplan+2019%252F+20+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, appears to contain the same lure text as the malicious URL, suggesting a coordinated effort to direct users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/pify?keyword=3.+bundesliga+spielplan+2019%252F+20+pdf
    • http://kekisofo.meikeourvillagehall.com/uploads/1/3/0/8/130813834/modir.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/20530354364.pdf
    • https://cdn.shopify.com/s/files/1/0450/1169/7814/files/tujuan_budaya_organisasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/8909603388.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/photodex_proshow_producer.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2013/files/pekisane.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/el_caliban_y_la_bruja_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/95880143606.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/zedofawi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/electrical_engineering_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5276/files/gigodo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/96854127621.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_off00007d31.bin
31c77693817c075e0a48abc907d04c170c4266b3327acc66997862a1802cb681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D31 5872 bytes
font_01_sfnt_off00009140.bin
ef0bb584419008fbd6c475bbfecff543500b3274bb70d3366f8cd0730c994508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9140 16484 bytes

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