Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e303fb5313fb4d…

MALICIOUS

PDF

42.4 KB Created: 2020-08-11 08:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dbe31cc20df93c9bc63a45d32da6992 SHA-1: fe3a54daca5a7f0e6d74e9ef55760a2e53a97242 SHA-256: 18e303fb5313fb4d40e9135313e8df92fac553011f7b32eae14a3d9ab0ee9200
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 a redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a 'Barron clothing catalogue pdf'. The primary malicious URL identified is https://ttraff.cc/pify?keyword=barron+clothing+catalogue+pdf, which is flagged as a known malicious redirector. This suggests the document is part of a phishing campaign or a distribution mechanism for further 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=barron+clothing+catalogue+pdf
    • http://gepor.mountaineerbassethounds.com/uploads/1/3/1/1/131164110/b98bf9.pdf
    • http://files.alycewolfe.com/uploads/1/3/1/3/131381677/nidimipapireji_pefobawavu.pdf
    • http://bapidi.nourishbodymindspirits.com/uploads/1/3/2/6/132696323/1588618.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/jeduzonokisovibabun.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/gta_iv_triner.pdf
    • https://cdn.shopify.com/s/files/1/0439/2439/0056/files/sisibeniziraponiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/tyranids_8th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/1302/0570/files/31199507309.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3893/files/15283489520.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/carrom_tournament_rules.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4087/files/warhammer_40k_adeptus_custodes_codex.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4682/files/wovisirepufunozed.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/cell_structure_and_function_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0431/7514/9719/files/american_english_file_1_workbook_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4902/files/49923975604.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/247_sudoku_easy.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_off00005add.bin
ce9146a8b313d2f52f2c4487cc04b0c4138a7d1cb0010fd97c163e42a4563508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADD 5172 bytes
font_01_sfnt_off00006c61.bin
f2a0647aa2465ff00a9aff17a00eb6d5a589803d55cc495952f590586c51613d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C61 9948 bytes
font_02_sfnt_off00008e53.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E53 4324 bytes

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