Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bf217ccf7c8e43…

MALICIOUS

PDF

33.2 KB Created: 2020-08-21 21:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdcc9172972633938d270dca4cc00730 SHA-1: b3b1193f309b5499fc1890fab66927bec317d202 SHA-256: 61bf217ccf7c8e4387605740b0c5890003a0a11c4f5ddf15a0d2b07bc71a3688
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, ttraff.cc. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and link farm are indicative of malicious intent, likely to lead users to malicious websites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=adnan+ma+hada+song+lyrics
    • http://files.alpinelegendspixiebobs.com/uploads/1/3/0/7/130776795/lekonuvuborod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7877/0085/files/cognizant_selenium_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/fabuvasozuvax.pdf
    • https://cdn.shopify.com/s/files/1/0430/0098/7801/files/63056206176.pdf
    • https://cdn.shopify.com/s/files/1/0430/5682/4471/files/wixisoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4449/4760/files/leadership_styles_journal_articles.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/virejo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0416/4257/files/71225446845.pdf
    • https://cdn.shopify.com/s/files/1/0428/3318/2886/files/agata_bielik_robson.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/convertir_en_ingles_a_espaol.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_off00004479.bin
ac4c1c2b6afe20369910cf45265d40da627819190c04545f7b96b688bca87e31
pdf-font-stream PDF embedded font (sfnt) at offset 0x4479 5444 bytes
font_01_sfnt_off000056cd.bin
8e3fbcae2f75356b35ec685b661bee8a13fae3c0281fdc21719369aa07cdb128
pdf-font-stream PDF embedded font (sfnt) at offset 0x56CD 9764 bytes