Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e78fba6081d614…

MALICIOUS

PDF

40.7 KB Created: 2020-08-21 13:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 799b610aea95ad87d9efc364fbfa1eab SHA-1: 03cd6c51644333c929bd4dffde91dac34618fd79 SHA-256: 75e78fba6081d61455fd935f54f7ccc3611316368910f2cf032761813a58c3c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify?keyword=bleacher+report+gaming+twitter. The ML classifier also strongly indicated maliciousness.

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=bleacher+report+gaming+twitter
    • http://files.roydays.info/uploads/1/3/1/8/131857270/wojafidebuzak.pdf
    • http://files.gallery109.ca/uploads/1/3/0/8/130874691/c646e.pdf
    • http://files.nyacuchiro.com/uploads/1/3/2/6/132680874/d46b5.pdf
    • http://files.treeservicekingsport.com/uploads/1/3/0/7/130775231/8465480.pdf
    • http://zekokif.goldenreiki.co.nz/uploads/1/3/1/4/131438304/dorebevofejinezeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1692/0994/files/crossword_answer_for_deliberate_ploy.pdf
    • https://cdn.shopify.com/s/files/1/0438/7844/9307/files/calculus_for_business_hoffman_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/4155/3575/files/98113435478.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/wenojutizagabofona.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/ethnography_research_method.pdf
    • https://cdn.shopify.com/s/files/1/0438/1750/0834/files/mcps_school_calendar_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0447/8782/6854/files/worldview_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/8348/9687/files/38074108575.pdf
    • https://cdn.shopify.com/s/files/1/0431/2881/5783/files/witcher_3_succubus_decoction.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/48216138563.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_off000043a4.bin
847f42cdbcbf1d36fda30552faa4dc64158eef69b9df24172179ff449c810b17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43A4 5308 bytes
font_01_sfnt_off00005597.bin
b5c50990f44d90d902b14437a3db886c9aacd61cc2e966b2535fc09a15a0ca37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5597 10100 bytes
font_02_sfnt_off0000721d.bin
ec53254a34258f905b21fbec4d5d2157a07c660dc8d2d0c7fa5ab186160e00f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721D 10412 bytes

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