Malicious PDF — malware analysis report

Static analysis result for SHA-256 2568ed77bbeb249a…

MALICIOUS

PDF

47.1 KB Created: 2020-08-12 07:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097197186ab7161272641fc56f3aac32 SHA-1: 6f378f8a180075d2a36491e06c5f3f1bf84eab9f SHA-256: 2568ed77bbeb249a00dec0c6cf8459360c267116b2886c470994336243a9f617
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as 'calculus pdf notes' that redirects to a known malicious domain (ttraff.com). This, combined with the ML classifier's high confidence and the PDF_SEO_LINK_FARM heuristic, indicates a phishing or redirection attempt. The document body, though heavily obfuscated, contains the malicious URL, suggesting the primary intent is to drive traffic to the redirector.

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=calculus+pdf+notes
    • http://kezotuk.tellicoplainspubliclibrary.org/uploads/1/3/1/3/131398140/gomag_xijok_fozeza.pdf
    • http://xusodi.armaturepilates.com/uploads/1/3/0/8/130814229/c3d9467e95952.pdf
    • http://files.editmythesis.com.au/uploads/1/3/1/1/131164275/lewejakolifaxuvukaw.pdf
    • http://files.orleanstrailresort.com/uploads/1/3/1/8/131856409/rifinalidunurola.pdf
    • https://cdn.shopify.com/s/files/1/0450/2352/7070/files/rifix.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7188/files/simple_rental_agreement_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2821/files/fojedevujomijazavamokod.pdf
    • https://cdn.shopify.com/s/files/1/0431/0607/4778/files/advanced_vocabulary_and_idioms_bj_thomas.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/translate_arabic_to_english_document.pdf
    • https://cdn.shopify.com/s/files/1/0437/8315/9970/files/56967608244.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7106/files/compound_adjective.pdf
    • https://cdn.shopify.com/s/files/1/0447/2376/5402/files/delegation_poker_karten.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6386/files/greenhouse_effect_worksheet_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5103/files/zawodivefokelupirumebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/49639349256.pdf
    • https://cdn.shopify.com/s/files/1/0438/2982/1600/files/nofavurufefa.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_off00007c19.bin
c17103b7682d77e0ff19ca39de27c4d402afd356a2727de2768694d7e10e099b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C19 4960 bytes
font_01_sfnt_off00008d09.bin
487f76159f6d5c01a6ac03030833d61abed430bb65488922ea5aac7c8525d6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D09 10148 bytes

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