Malicious PDF — malware analysis report

Static analysis result for SHA-256 587acf2ce85d5498…

MALICIOUS

PDF

50.8 KB Created: 2020-08-05 15:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ca371e94ec82222ea5bb06c23a4239 SHA-1: b6bea054d5c2fec3c91eeece45426fe8ee249afb SHA-256: 587acf2ce85d549878b19af730a3c3dc6952906b0f477766e82270da1be21f00
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with the primary URL pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains this malicious URL, suggesting a lure to external content. The ML classifier strongly indicated maliciousness, supporting the heuristic findings of a malicious redirector and a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=cambridge+advanced+learner+s+dictionary+4th+edition+free+download+pdf
    • http://files.auntiecathycares.com/uploads/1/3/2/3/132303270/6f158875.pdf
    • http://files.ewiechart.com/uploads/1/3/2/3/132302913/gomokiwu-dapewijutufose-jofumuvusu.pdf
    • http://nufuliw.peneloperosecowley.com/uploads/1/3/2/6/132681579/fizuzujedozi-lonen.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/bagamabuwoputibebebewara.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/23172559800.pdf
    • https://cdn.shopify.com/s/files/1/0433/4436/3678/files/64071939202.pdf
    • https://cdn.shopify.com/s/files/1/0432/6404/9318/files/14761227113.pdf
    • https://cdn.shopify.com/s/files/1/0433/9200/8357/files/systema_martial_arts.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/tadawekijasapabelag.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/critical_thinking_course_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7778/files/7670735195.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5232/files/nisojab.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1559/files/4414103147.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/db_2013_pg_22557-_22559.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000533b.bin
127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x533B 6744 bytes
font_01_sfnt_off00006422.bin
a50382b97dec596e06f8502459115022165d2ae088021a57487bd75f140ad06c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6422 5956 bytes
font_02_sfnt_off00007859.bin
743cb9871221853d7ae43b2f17b3b6cd68e920fa0a8301412fedb81b285fe505		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7859 11948 bytes
font_03_sfnt_off00009e1d.bin
5a685cfd8d005faca6836d9764a23c29462599c34f240050c47048e3dc98f5bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E1D 16808 bytes
font_04_sfnt_off0000b54f.bin
1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 1736 bytes

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