Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d7a15d42616842…

MALICIOUS

PDF

43.6 KB Created: 2020-08-10 09:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9bb82dc84365991ec3625b1a035e153 SHA-1: 5375be3cc071e51811cb05aca4f9c45aa559c43e SHA-256: b3d7a15d426168428d240abae7eeee64e4ff1a78558b52abbcb44f4efeab46ae
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, contains the text "Certificate border pdf" and the URL `https://ttraff.ru/pify?keyword=certificate+border+pdf`, suggesting a lure to trick users into clicking malicious links. 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.ru/pify?keyword=certificate+border+pdf
    • http://files.estellessweetitchblankets.com/uploads/1/3/1/4/131409170/tixavaxanepuluxuvit.pdf
    • http://files.quillskywritings.com/uploads/1/3/1/8/131856409/231239c3a6a691.pdf
    • http://files.smilecommunicationsgroup.com/uploads/1/3/2/6/132681002/vebevemiru.pdf
    • http://rikemabe.rammothdm.org/uploads/1/3/2/6/132681579/bovifefid.pdf
    • http://files.shirleywulab.com/uploads/1/3/0/9/130969237/8c6e3.pdf
    • https://cdn.shopify.com/s/files/1/0430/8221/9674/files/21614816175.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/bbva_api_market.pdf
    • https://cdn.shopify.com/s/files/1/0429/1421/8143/files/kerukexifab.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/zujuvefuvaroj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/falimuredokujo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/fijiletobogemukebeg.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9097/files/novel_habibie_dan_ainun_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/19415281037.pdf
    • https://cdn.shopify.com/s/files/1/0448/2197/1104/files/arlberg_ski_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/jituxozer.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19490865332.pdf
    • https://cdn.shopify.com/s/files/1/0431/1210/4103/files/80067114092.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8544/files/pivofukopuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/21530177252.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060aa.bin
9307d8e1d53a38d2065907d79dbc1d19fbc96c78dac7be87513175117c133069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60AA 4784 bytes
font_01_sfnt_off000070f3.bin
f2d09f8819ec1ae078883236c9374b8438d11140d9ad5293b104a88e24ed8ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F3 9948 bytes
font_02_sfnt_off000092fa.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92FA 4324 bytes

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