Malicious PDF — malware analysis report

Static analysis result for SHA-256 188ed3a27dd730d2…

MALICIOUS

PDF

52.4 KB Created: 2020-08-30 04:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0ed49c89616be9081b8d018fd860241 SHA-1: 4212d651f1847b9629572578bc584c23ffc7fcbb SHA-256: 188ed3a27dd730d277c9623ef7910b7f9ee29f535c5f40a1155d542851ae9d21
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the redirector link indicate an attempt to lead the user to malicious content, likely for phishing or malware distribution.

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.ru/wix?keyword=meditations+a+new+translation+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7039/8372/files/ridun.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/gepinivodopa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0436/7728/6553/files/8046834145.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/sovisakotexilulavosanopod.pdf
    • https://cdn.shopify.com/s/files/1/0434/1845/2120/files/adjectives_with_ed_and_ing_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/7004/5864/files/podoforegobiberikup.pdf
    • https://static.usrfiles.com/ugd/b8c837_20ef6ccba5964ecfb694e2da3c44c52b.pdf
    • https://static.usrfiles.com/ugd/d162e3_2bb524c858de4244a7132e004a0bbb46.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/50866924322.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3635/files/node_js_socket_io_example.pdf
    • https://cdn.shopify.com/s/files/1/0438/4191/2997/files/juwepupafinobukomagoj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6408/0024/files/al_quran_madinah_terjemahan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008261.bin
eb0ccad13e8d2b179b176d4bf00144c5f212eaf595f03166cba6bcc2328d0467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8261 4920 bytes
font_01_sfnt_off00009337.bin
2da66a410a753cc7f36fe476d2d7463431004daa0ee20fc7715211cfdea089fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9337 10316 bytes
font_02_sfnt_off0000b684.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB684 4324 bytes

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