Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1daa1c75ff33aa…

MALICIOUS

PDF

41.9 KB Created: 2020-07-10 01:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: ce67afc1e5b2c864fd09219bfc9f6a06 SHA-1: a8f8ce7903a1a3808bc9c374c5bdff4d67dd182c SHA-256: bc1daa1c75ff33aac002f723cfaa78c0d4d4fd291a2460a11f33145f2705ef2f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, forming a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged it as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially harmful content or engaging in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=egotistical%20sublime%20pdf In PDF document text
    • http://files.alfatihainstitute.com/uploads/1/3/1/4/131438024/762531259ac1.pdfIn PDF document text
    • http://files.ajeplanners.com/uploads/1/3/1/4/131406816/sifojopese_nidukuzinagimo_xutokajofuzi_roxurugar.pdfIn PDF document text
    • http://files.kathylevandoski.com/uploads/1/3/0/8/130873984/3f34a.pdfIn PDF document text
    • http://files.ameafterdark.com/uploads/1/3/1/4/131483391/6013168.pdfIn PDF document text
    • http://files.yourhomey.com/uploads/1/3/1/3/131384468/xaxifege.pdfIn PDF document text
    • http://files.dwharris.net/uploads/1/3/0/9/130969842/81c22004.pdfIn PDF document text
    • http://files.witinallshop.com/uploads/1/3/1/4/131453021/ae1e5.pdfIn PDF document text
    • http://files.imperialsolutionsllc.com/uploads/1/3/1/3/131380236/zumowivomox-wozos.pdfIn PDF document text
    • http://files.thankfulrecords.com/uploads/1/3/0/8/130814735/7376362.pdfIn PDF document text
    • http://files.tcpmagic.com/uploads/1/3/1/3/131379991/b5b09b4.pdfIn PDF document text
    • http://files.paulaspatch.com/uploads/1/3/0/8/130813120/bejigufilu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wimaped597797669.files.wordpress.com/2020/06/wemodewobotuzuv.pdfIn PDF document text
    • https://xezerak.files.wordpress.com/2020/06/vegijepamefefasokav.pdfIn PDF document text
    • https://runokuxuzeni.files.wordpress.com/2020/06/18870444956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6611 5252 bytes
SHA-256: d8b98d84f71f72785432f50c8906f033d25142c15f78fd18a10e95d6b03d6bf9
font_01_sfnt_off000077fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77FE 10112 bytes
SHA-256: 909f707ce60aaa5742b57f87e0720679bbf9bef05876cb92daef2a1092101ffb