Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f377a9d551bf234…

MALICIOUS

PDF

33.4 KB Created: 2020-08-25 17:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e0624ef0b09a4bffecc61660a4028d0 SHA-1: fa94e4c81cc16c2ebb86ab9a50a588b86907cef1 SHA-256: 9f377a9d551bf2342745ecc0ff6767da444921d4fbaed2fd99e8f43e33d7393e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF document contains numerous invisible links, including a CAPTCHA-themed lure and links to a known malicious redirector at 'ttraff.ru'. It also features a large link farm pointing to other PDFs hosted on cdn.shopify.com and various other domains. The document body is heavily obfuscated but contains the primary redirect URL. This suggests a multi-stage lure designed to lead the user to malicious content, likely for phishing or malware delivery.

Heuristics 5

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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=whose+uncle+graphing+worksheet
    • http://files.rachelmariephotography.net/uploads/1/3/1/3/131383837/zijal.pdf
    • http://gimijegew.melvinmorsemd.com/uploads/1/3/0/7/130776102/jutetanezavonako.pdf
    • http://xidik.wheatgrasspublishing.com/uploads/1/3/2/6/132680981/e547940.pdf
    • http://files.snow-channel.com/uploads/1/3/0/8/130813330/nimoj.pdf
    • http://files.ok123plus.com/uploads/1/3/0/7/130775712/ratetedijibasen.pdf
    • https://cdn.shopify.com/s/files/1/0441/0572/8152/files/bozenawulijavidefopo.pdf
    • https://cdn.shopify.com/s/files/1/0450/7402/2550/files/abbyy_transformer_plus_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8574/9665/files/26593952587.pdf
    • https://cdn.shopify.com/s/files/1/0435/5381/6728/files/68365082365.pdf
    • https://cdn.shopify.com/s/files/1/0434/6318/0454/files/60069866814.pdf
    • https://cdn.shopify.com/s/files/1/0436/4068/4697/files/kawabeti.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/mizikikilugezonab.pdf
    • https://cdn.shopify.com/s/files/1/0459/7710/8647/files/gsa_captcha_breaker_free.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_off000045c5.bin
8ed2137326eb6684c96e286a9a283133ae9d85b49bf29325e483835ae2d810a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x45C5 5364 bytes
font_01_sfnt_off00005814.bin
c45561da4168ec428027e2adf07166add06661354bf4e7dc62a057ead359b24a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5814 9548 bytes