Malicious PDF — malware analysis report

Static analysis result for SHA-256 de905d6d45cd0b70…

MALICIOUS

PDF

51.0 KB Created: 2020-08-11 15:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd1a8a79a0b8c5e1dd27a204bc5b3866 SHA-1: 134c32a88c4ee96e2906d967230468e44d0524b2 SHA-256: de905d6d45cd0b701335e1f075f6f871c90466fe58b2da7fc0c344bad244ae67
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains the URL 'https://ttraff.com/pify?keyword=cours+anglais+pdf', which is identified as a malicious redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm designed to drive traffic to malicious sites.

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.com/pify?keyword=cours+anglais+pdf
    • http://files.stevehowell.net/uploads/1/3/2/6/132681293/polozufusor.pdf
    • http://files.conesetsclass.com/uploads/1/3/2/7/132740361/2808063.pdf
    • http://files.minetticustomkeyboards.com/uploads/1/3/1/1/131164431/6759b919a.pdf
    • http://files.cyclekingston.ca/uploads/1/3/2/7/132712358/5940595.pdf
    • http://sogawuv.privateislandsproject.com/uploads/1/3/1/3/131379803/77360cf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37237973095.pdf
    • https://cdn.shopify.com/s/files/1/0429/2342/5955/files/fakajutaxisowuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zokiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/74593981418.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/2309779609.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/86189718834.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/bilix.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/22576674402.pdf
    • https://cdn.shopify.com/s/files/1/0439/4500/1115/files/77128981847.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/angular_js_tutorialspoint.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5675/files/binary_to_decimal_java.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9163/files/1549256369.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006963.bin
902da8ff7ad81ce87de4abbfdd53626023fd025e821139dc0b21e5e92a81bbf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6963 6504 bytes
font_01_sfnt_off00007999.bin
1e6dd1e49cedd1f92b072ac5332214179e8e296cd570fc7c172fa80403f52361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7999 4916 bytes
font_02_sfnt_off00008a53.bin
8009ae6ca557519b2017c381ce27d455fdb3e02756e96067e04140bf6ad6e904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A53 11832 bytes
font_03_sfnt_off0000af2d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2D 4324 bytes

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