Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d8a984991730ed…

MALICIOUS

PDF

46.1 KB Created: 2020-07-10 04:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d09385432900180f370f1d7779e49dcf SHA-1: fe040af12e6dcc146d5cffecd7c721556b49a112 SHA-256: b1d8a984991730ed65d2e0d73efdf67a6369350058fb363c84a070e87272fed9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The document body, while containing seemingly innocuous text about 'Lewis dot structure', is primarily a vehicle for these links. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to harmful infrastructure.

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.ru/wb?keyword=lewis%20dot%20structure%20for%20ionic%20and%20covalent%20compounds%20worksheet
    • http://files.terrasoulherbs.com/uploads/1/3/1/3/131380183/4219b1.pdf
    • http://files.alexismariephotoanddesigns.com/uploads/1/3/1/8/131856556/mesojutu.pdf
    • http://files.hivibeliving.com/uploads/1/3/1/4/131437513/462523b.pdf
    • http://files.scoilursula.com/uploads/1/3/0/7/130775192/8d8051972.pdf
    • http://files.reikifortheplanet.com/uploads/1/3/2/3/132302815/5645773.pdf
    • http://files.psms95x.org/uploads/1/3/0/7/130776739/lazogove-sedezedexamo.pdf
    • http://files.called2mission.com/uploads/1/3/1/4/131407112/3477970.pdf
    • http://files.taxi-service.us/uploads/1/3/2/6/132683088/40127930cf.pdf
    • https://gosigisor.files.wordpress.com/2020/06/fivafexarimolekuzon.pdf
    • https://tixeromadedu.files.wordpress.com/2020/07/92224535968.pdf
    • https://kanijumedox.files.wordpress.com/2020/06/pudepibijidavesuteveneka.pdf
    • https://busiputojug.files.wordpress.com/2020/06/1545267249.pdf
    • https://ribowil807386363.files.wordpress.com/2020/07/2461171079.pdf
    • https://zigonasoxovu.files.wordpress.com/2020/07/84121040700.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59577082877.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60233972239.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97072231683.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_off000075a9.bin
b0432351d30694624796f723ead7b1b280b4e7262fd4cf851e8100a77207679b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75A9 5436 bytes
font_01_sfnt_off0000880e.bin
2c6520de7f0dabf8fb22074d1526a26fefd01d002bf99b7b72acd7a337045e6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x880E 10188 bytes

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