Malicious PDF — malware analysis report

Static analysis result for SHA-256 b408bb443960d26c…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 08:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cae38ab259f044f0ec43110c31200de SHA-1: 955e9b4ad26ca77e2e6b629d60a78de268f63981 SHA-256: b408bb443960d26c026cfcbf6b82a0c07dfa4ff775aad3544cfbcb163a723a9d
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=%25C3%25A9valuation+lecture+compr%25C3%25A9hension+ce2+p%25C3%25A9riode+5'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure related to educational content. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=%25C3%25A9valuation+lecture+compr%25C3%25A9hension+ce2+p%25C3%25A9riode+5
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/muvodagiluv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0430/4178/3959/files/gupolulemitemoxogot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3251/8549/files/solisilosasupoteku.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/41886924550.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/34279416489.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7816/files/37714592229.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/fijupajukotafiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/b_r_automation_studio_4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69892687871.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/automation_test_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/rubasanirez.pdf
    • https://cdn.shopify.com/s/files/1/0433/3817/0523/files/nelapadibavuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4126/6587/files/1884532348.pdf
    • https://cdn.shopify.com/s/files/1/0430/4008/0023/files/github_delete_commit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8053/files/electronegativity_and_bonding_worksheet_answers.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_off00005f15.bin
1a90971de53f00545c398d7fce47ceb107b7c49c46dabe2cdb0c828fb7946ecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F15 5748 bytes
font_01_sfnt_off0000723d.bin
f3a2ca40e0f5fc0061fb0ef79d616e1a576647e202e24edc068a174048328e8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x723D 11768 bytes