Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eca93a09a48240c…

MALICIOUS

PDF

35.2 KB Created: 2020-08-13 22:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 813d9b559b763bc39d81ced2aed0ee3c SHA-1: ae7afba8730ab5a7a37585279fe39cc360c626e6 SHA-256: 0eca93a09a48240c0b7df8ba5cf5fb43c85c5a81d1379785bc731176025a3231
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a link farm or redirection scheme designed to lead users to malicious content.

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=castellan+physical+chemistry+pdf+free
    • http://files.pacificrimfoundation.org/uploads/1/3/1/3/131381553/filulapalelab_relilaso.pdf
    • http://files.quizking.net/uploads/1/3/1/8/131871518/3d2020a97e.pdf
    • http://files.tourism.myosceolachamber.org/uploads/1/3/1/4/131453054/jegititufavat_fawugife_notasixu_jafipakor.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/accounting_aptitude_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/lejusirubafuvodidis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7980/2782/files/3500482808.pdf
    • https://cdn.shopify.com/s/files/1/0435/5869/9159/files/talk_incoherently_jabber_crossword.pdf
    • https://cdn.shopify.com/s/files/1/0433/9430/2117/files/60469024877.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/zediselo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9746/4731/files/wumonajebuvabexigetu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6081/2189/files/842318731.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/bowovavusunovedufes.pdf
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/68054945022.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/vuwaxiremesakegadejimetud.pdf
    • https://cdn.shopify.com/s/files/1/0448/2197/1104/files/acupuncture_point_combinations_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/aptitude_test_book_ethiopia.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_off00004c1f.bin
199a0e60d4b2ad12db33321e44d27434e62701c6110ee65e691306102fb93d85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C1F 5404 bytes
font_01_sfnt_off00005e51.bin
cd75b6e2a1adeaacdb1555dbefe3b4459d9434b34972ee9a41cce6d567c74594		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E51 9876 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.