Malicious PDF — malware analysis report

Static analysis result for SHA-256 a833f1f2d4cfcbec…

MALICIOUS

PDF

45.8 KB Created: 2020-08-02 09:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9430dbfd514b01c969d2790983f6eb1 SHA-1: 868fe349524109251844652cf9b467d37ccd03d8 SHA-256: a833f1f2d4cfcbec5fb127500ef1d00856940a767d74156042a1fe0b3f1a3b3e
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=%25D0%25BF%25D0%25BE%25D0%25BA%25D0%25B5%25D1%2580+%25D0%25BE%25D0%25BD%25D0%25BB%25D0%25B0%25D0%25B9%25D0%25BD+%25D0%25B1%25D0%25B5%25D0%25B7+%25D1%2580%25D0%25B5%25D0%25B3%25D0%25B8%25D1%2581%25D1%2582%25D1%2580%25D0%25B0%25D1%2586%25D0%25B8%25D0%25B8, which is likely used to direct users to malicious content. The presence of numerous other links, many hosted on cdn.shopify.com, suggests a broad distribution effort for a phishing or scam campaign.

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.ru/pify?keyword=%25D0%25BF%25D0%25BE%25D0%25BA%25D0%25B5%25D1%2580+%25D0%25BE%25D0%25BD%25D0%25BB%25D0%25B0%25D0%25B9%25D0%25BD+%25D0%25B1%25D0%25B5%25D0%25B7+%25D1%2580%25D0%25B5%25D0%25B3%25D0%25B8%25D1%2581%25D1%2582%25D1%2580%25D0%25B0%25D1%2586%25D0%25B8%25D0%25B8
    • http://files.focusonthegood.com/uploads/1/3/1/6/131637606/zaruvipopogodim.pdf
    • http://files.brittanysloan.com/uploads/1/3/2/7/132710491/jojedubibufil-gimafige-jiluxokuvajas-sunozamas.pdf
    • http://files.carnegieinvest.com/uploads/1/3/0/7/130739214/tibegow_naderobepo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/20264776764.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/81327109101.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/48706229444.pdf
    • https://cdn.shopify.com/s/files/1/0429/2024/7462/files/37959747685.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/63495700793.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/nexetetosavum.pdf
    • https://cdn.shopify.com/s/files/1/0435/9333/4952/files/running_man_355.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1821/files/diver.pdf
    • https://cdn.shopify.com/s/files/1/0435/5486/5320/files/35931881709.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/31047558798.pdf
    • https://cdn.shopify.com/s/files/1/0437/9050/0001/files/doubly_linked_list_template_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/koxilekovipufovusep.pdf
    • https://cdn.shopify.com/s/files/1/0434/1714/1415/files/uninstall_sophos_mac.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_off00006666.bin
cbe24dca9d7e8b14d7e0a81ea091fc787ea52d9a173588f2d5a030f3d7e8ec75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6666 5720 bytes
font_01_sfnt_off0000794b.bin
51a76d723f07ddac16f8aad7b59cf326b7576c02871a616f947fb76c552a51cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794B 14696 bytes

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