Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd82189ad4b6d90…

MALICIOUS

PDF

40.6 KB Created: 2020-08-23 17:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce63dd2150ef11ccafe88b7996717941 SHA-1: 400f91a071a9bcab22c22c94adbf1825bc9ace0b SHA-256: ecd82189ad4b6d9016cb7c977200750f409f90431837e0976e3e1db5a1c59992
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as an 'Edexcel candidate declaration form'. This indicates a phishing or malware distribution attempt. The document also hosts a large number of other PDF links, many pointing to Shopify, which is characteristic of SEO link farm abuse for traffic redirection or SEO manipulation. 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.cc/pify?keyword=edexcel+candidate+declaration+form
    • http://files.virlinafuture.org/uploads/1/3/1/3/131378993/manot_forigore.pdf
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/67211733254.pdf
    • https://cdn.shopify.com/s/files/1/0433/5573/4166/files/15378168891.pdf
    • https://cdn.shopify.com/s/files/1/0463/1825/6288/files/73748223351.pdf
    • https://cdn.shopify.com/s/files/1/0434/1304/5398/files/37220918612.pdf
    • https://cdn.shopify.com/s/files/1/0440/6195/0117/files/apache_tomcat_8._5._37.pdf
    • https://cdn.shopify.com/s/files/1/0437/7031/4903/files/jayco_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7873/7302/files/rastafarian_history_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/vizekudori.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/korodexul.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/complete_tutorial_of_ms_office.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6339/files/faralasut.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/libipiwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/callese_y_venda_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/6244/2661/files/rawoborozo.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_off00006194.bin
c182d139e1d4cfcc34e9f07d1a6695cd6f0d0a3c3cdd5e83951a7f9037083eb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6194 5016 bytes
font_01_sfnt_off0000728a.bin
a302a81480c757c79d34e2a00cdab019d4a564e3e9a06d9259ac4e117a0856b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x728A 10172 bytes