Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2d11a3f2f94b38…

MALICIOUS

PDF

43.9 KB Created: 2020-08-12 21:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6804925268e60aabae889090537e387e SHA-1: 78bbeabcdb6d42051108b3e8e864216a7441ba73 SHA-256: 7e2d11a3f2f94b3885f10850052100ab7dd23a0f1ad0866028579465358b5821
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to a redirector service, likely intended to lead the user to malicious content or phishing pages. The presence of a large number of external PDF links further supports the idea of a link farm designed to obscure malicious intent.

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=learned+optimism+pdf
    • http://files.linemantrainer.com/uploads/1/3/1/4/131438405/7482358.pdf
    • http://files.miortuk-alaskan-husky-kennel.com/uploads/1/3/1/4/131406149/75140.pdf
    • http://tumaru.neverwares.ca/uploads/1/3/0/7/130776688/patev.pdf
    • http://fadaru.en.agiteysirva.com/uploads/1/3/1/3/131382406/dobewiru_ronil_kodotovisu_besalade.pdf
    • http://files.corbyphotoclub.co.uk/uploads/1/3/2/6/132681558/6038489.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2656/2722/files/50402040536.pdf
    • https://cdn.shopify.com/s/files/1/0437/1628/0475/files/tewaruvokajemajofud.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5265/files/1104208753.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/dijizedis.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/10th_class_2020_date_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/3900/6615/files/9555798126.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/60036946374.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/gefunulurawanojop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/razikeruranofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/katidafofositijiv.pdf
    • https://cdn.shopify.com/s/files/1/0440/8262/6710/files/gavuxojijotonasibo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/3ds_max_tutorials_for_beginners_in_urdu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006def.bin
2efe9a41288a092af69e4a124f79c37bb6fc0f27f7990ed8c6efbc589df94464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEF 5096 bytes
font_01_sfnt_off00007f2c.bin
a32f377e87d240a58008526fd26bbc4742af3b00c97e2327d17b0941dcc7a913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2C 10352 bytes

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