Malicious PDF — malware analysis report

Static analysis result for SHA-256 743742782961aa06…

MALICIOUS

PDF

51.5 KB Created: 2020-08-03 12:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58867ec03ac1403461dfc66ebc1cca19 SHA-1: 538319f766d45b3d37b7d3f702061e25a2494189 SHA-256: 743742782961aa06f13720f4edfcd5734a3eff99eb74c9d75ef11cea13fd5227
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector (ttraff.com). The document body, though partially corrupted, contains text referencing a PDF download and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it is part of a link farm, likely for SEO poisoning or distributing 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.com/pify?keyword=livro+admir%25C3%25A1vel+mundo+novo+em+pdf
    • http://files.ciccologroup.com/uploads/1/3/1/4/131408432/2faa0a43.pdf
    • http://files.allycole.com/uploads/1/3/0/7/130739379/mukuxafelewabaj.pdf
    • http://files.westsuffolkhomeed.org.uk/uploads/1/3/0/7/130739343/farowuxuja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/jalal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/71645744167.pdf
    • https://cdn.shopify.com/s/files/1/0438/2064/6562/files/77529706663.pdf
    • https://cdn.shopify.com/s/files/1/0431/1810/0637/files/hunger_games_book_series_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1056/3994/files/6444041822.pdf
    • https://cdn.shopify.com/s/files/1/0436/5638/0574/files/python_create_text_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/1820/6887/files/chinese_identity_card_number_generator.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/petsafe_wireless_pet_containment_system_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/18486528826.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7462/files/dewoxuxexetefetut.pdf
    • https://cdn.shopify.com/s/files/1/0433/5281/7832/files/32012197539.pdf
    • https://cdn.shopify.com/s/files/1/0437/5655/2343/files/86356302235.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/55404894450.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_off000085c3.bin
9a2a50dc6714c01f843ccb4369bdea1dbfdb91f1dbf1a3164bf81f1f2ac795ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85C3 5244 bytes
font_01_sfnt_off00009703.bin
dbbb2c07bc5a69b15d29c7149eee6b0288776f9c4dd157ab929b903a6d462eeb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9703 13052 bytes

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