Malicious PDF — malware analysis report

Static analysis result for SHA-256 5809656bfa95b4a9…

MALICIOUS

PDF

41.1 KB Created: 2020-08-07 02:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f10d3edfc4c812103793e19feed2d94f SHA-1: 8030c4d970fbbe25d498d05afc563ac37b24a40f SHA-256: 5809656bfa95b4a985e6cdf0363682a5eba5a44258f1c3b272189bbb2b7b5d81
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at ttraff.ru. This suggests a link-farming or redirection attack designed to lead users to malicious content. The document body, though heavily obfuscated, contains the same malicious URL and a list of other URLs, reinforcing the attack pattern. No scripts were extracted, but the PDF structure itself is weaponized for redirection.

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.ru/pify?keyword=administra%25C3%25A7%25C3%25A3o+de+marketing+14o+edi%25C3%25A7%25C3%25A3o+pdf
    • http://files.visiblechurchgb.com/uploads/1/3/1/3/131381021/f2b47e124bac4.pdf
    • http://files.kidsneedyoga.com/uploads/1/3/1/4/131438786/zafasaza.pdf
    • http://files.southeasternpermaculture.org/uploads/1/3/0/7/130740011/ffcec14984a.pdf
    • http://files.jacksonartwear.com/uploads/1/3/1/4/131453170/3011892.pdf
    • http://files.clpearsondesigns1.com/uploads/1/3/2/6/132681757/0a10ac87d3ff1.pdf
    • https://cdn.shopify.com/s/files/1/0427/8868/3932/files/60817302321.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/72636776952.pdf
    • https://cdn.shopify.com/s/files/1/0449/3757/6603/files/877_445_7469.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/calendario_oficial_2020_argentina.pdf
    • https://cdn.shopify.com/s/files/1/0429/0274/9347/files/bahasa_arab_anggota_tubuh.pdf
    • https://cdn.shopify.com/s/files/1/0437/6454/7741/files/nilevewumut.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/97497901036.pdf
    • https://cdn.shopify.com/s/files/1/0433/0507/4838/files/export_illustrator.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/luluzawuvino.pdf
    • https://cdn.shopify.com/s/files/1/0432/1427/4720/files/2527502835.pdf
    • https://cdn.shopify.com/s/files/1/0451/3752/6949/files/functionalist_on_education.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_off00005b22.bin
10e75b49c79b921d7ef8cba5f4a44f17f46d6e9bc4f7a2210496936353b3fe8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B22 6020 bytes
font_01_sfnt_off00006f08.bin
58adff8e503a666cd2d3824ecaa17ff19373d67daf5d3ab6f53fa7c02599cf36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F08 12804 bytes

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