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)
MD5: ce67afc1e5b2c864fd09219bfc9f6a06 SHA-1: a8f8ce7903a1a3808bc9c374c5bdff4d67dd182c SHA-256: bc1daa1c75ff33aac002f723cfaa78c0d4d4fd291a2460a11f33145f2705ef2f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.001 Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded URLs, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body and embedded links suggest a campaign to drive traffic to potentially malicious or phishing sites, possibly for SEO poisoning or credential harvesting.

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/wb?keyword=egotistical%20sublime%20pdf
    • http://files.alfatihainstitute.com/uploads/1/3/1/4/131438024/762531259ac1.pdf
    • http://files.ajeplanners.com/uploads/1/3/1/4/131406816/sifojopese_nidukuzinagimo_xutokajofuzi_roxurugar.pdf
    • http://files.kathylevandoski.com/uploads/1/3/0/8/130873984/3f34a.pdf
    • http://files.ameafterdark.com/uploads/1/3/1/4/131483391/6013168.pdf
    • http://files.yourhomey.com/uploads/1/3/1/3/131384468/xaxifege.pdf
    • http://files.dwharris.net/uploads/1/3/0/9/130969842/81c22004.pdf
    • http://files.witinallshop.com/uploads/1/3/1/4/131453021/ae1e5.pdf
    • http://files.imperialsolutionsllc.com/uploads/1/3/1/3/131380236/zumowivomox-wozos.pdf
    • http://files.thankfulrecords.com/uploads/1/3/0/8/130814735/7376362.pdf
    • http://files.tcpmagic.com/uploads/1/3/1/3/131379991/b5b09b4.pdf
    • http://files.paulaspatch.com/uploads/1/3/0/8/130813120/bejigufilu.pdf
    • https://wimaped597797669.files.wordpress.com/2020/06/wemodewobotuzuv.pdf
    • https://xezerak.files.wordpress.com/2020/06/vegijepamefefasokav.pdf
    • https://runokuxuzeni.files.wordpress.com/2020/06/18870444956.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xoxolesusoziviro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87294954422.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13139855908.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovaje.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

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

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