Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afcb16d69e700dd…

MALICIOUS

PDF

35.5 KB Created: 2020-08-23 07:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3673f3b48c168f0c1bc3f2951202465d SHA-1: 5245d2f4cca2a21b9f5bf345aa51fdcfa7bb85b9 SHA-256: 9afcb16d69e700dd778a1dfae9b6a576203c6114356fbefe5dafead2410e14dc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic indicates a malicious redirector link to 'ttraff.cc', which is likely used to host further malicious content or phishing pages. The document body, though partially corrupted, contains the same malicious URL, reinforcing the lure. 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=reflexive+and+intensive+pronouns+worksheet+with+answers
    • http://files.cheamtradingpost.com/uploads/1/3/2/8/132816036/2624235.pdf
    • http://nogotob.dhhdancecollaborative.com/uploads/1/3/1/6/131606289/2574536.pdf
    • https://cdn.shopify.com/s/files/1/0440/5651/0616/files/58674526103.pdf
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/aadhaar_card-_update_apk.pdf
    • https://cdn.shopify.com/s/files/1/0448/7803/7159/files/36455904946.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78578063821.pdf
    • https://cdn.shopify.com/s/files/1/0445/6048/2463/files/library_indexing_and_abstracting.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/71181524290.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2313/files/bukoxegoligomipulonijog.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/82452214530.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/taleluwawokub.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/fusionner_un_fichier_en_ligne.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6930/files/apache_tomcat_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/9972/4702/files/makodeza.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/54564440746.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_off00004b2d.bin
8c532afaac1c1af9fd3b110aa7b52019a09309224ce264f179e05681857b47bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B2D 5420 bytes
font_01_sfnt_off00005dba.bin
4bc0ca90a17c2ea5d8875e4feb0d58563bf8e1f8ed15f91c638a8d91a4b0a19e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBA 9756 bytes