Malicious PDF — malware analysis report

Static analysis result for SHA-256 0019b6ef27ab2767…

MALICIOUS

PDF

43.6 KB Created: 2020-08-07 20:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abe62abd218fb1c6f072ec8072511549 SHA-1: 50fc45a5fcf8ea504735a17c93d52a3791a14a20 SHA-256: 0019b6ef27ab2767f57979fc72fa82ab32fccadf9ba9ad196c7ba1050d737f19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1200 Hardware Add-in Systems T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One critical heuristic identified a redirector link to 'ttraff.com', indicating a malicious redirection attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

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=administra%25C3%25A7%25C3%25A3o+cientifica+resumo+pdf
    • http://files.fblbasketball.com/uploads/1/3/1/0/131070539/798e4210a7dd37.pdf
    • http://files.syntheticephemera.com/uploads/1/3/0/8/130814980/gigamad-pubeporef-vowuzaxev-muwumexedumonuz.pdf
    • http://files.ionamccuaig.co.uk/uploads/1/3/1/3/131379134/0f8fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2348/2525/files/javascript_tutorial_full.pdf
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/xorekonifiradimeweno.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/dafedupegudeguvafuse.pdf
    • https://cdn.shopify.com/s/files/1/0432/2400/6823/files/bivoxuvorikomuxega.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6534/files/32761470895.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/mebimilejub.pdf
    • https://cdn.shopify.com/s/files/1/0432/0270/7615/files/blank_calendar_may_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/4292/9821/files/xipen.pdf
    • https://cdn.shopify.com/s/files/1/0435/8314/4104/files/zufatipurumawugosop.pdf
    • https://cdn.shopify.com/s/files/1/0430/3152/7575/files/33239278451.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/8599377573.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/usmc_6105.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/deridero.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_off0000687a.bin
0b6e53883dec838632ad0abc916d5f182700e3ce1e2341fe9a80cf9d9e24f4a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687A 5760 bytes
font_01_sfnt_off00007b1e.bin
f47f3d9ba7d431572c6b012f55c424c16dceb1e691b1fccba189eefeaa8f5bb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1E 11988 bytes

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