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) First seen: 2020-09-24
MD5: d09385432900180f370f1d7779e49dcf SHA-1: fe040af12e6dcc146d5cffecd7c721556b49a112 SHA-256: b1d8a984991730ed65d2e0d73efdf67a6369350058fb363c84a070e87272fed9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded URLs, masquerading as a worksheet, which is a common tactic for SEO link farms and potentially malicious redirects. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the sheer volume and nature of the links suggest an intent to drive traffic to potentially harmful sites, possibly for phishing or malware distribution.

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.ru/wb?keyword=lewis%20dot%20structure%20for%20ionic%20and%20covalent%20compounds%20worksheet In PDF document text
    • http://files.terrasoulherbs.com/uploads/1/3/1/3/131380183/4219b1.pdfIn PDF document text
    • http://files.alexismariephotoanddesigns.com/uploads/1/3/1/8/131856556/mesojutu.pdfIn PDF document text
    • http://files.hivibeliving.com/uploads/1/3/1/4/131437513/462523b.pdfIn PDF document text
    • http://files.scoilursula.com/uploads/1/3/0/7/130775192/8d8051972.pdfIn PDF document text
    • http://files.reikifortheplanet.com/uploads/1/3/2/3/132302815/5645773.pdfIn PDF document text
    • http://files.psms95x.org/uploads/1/3/0/7/130776739/lazogove-sedezedexamo.pdfIn PDF document text
    • http://files.called2mission.com/uploads/1/3/1/4/131407112/3477970.pdfIn PDF document text
    • http://files.taxi-service.us/uploads/1/3/2/6/132683088/40127930cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gosigisor.files.wordpress.com/2020/06/fivafexarimolekuzon.pdfIn PDF document text
    • https://tixeromadedu.files.wordpress.com/2020/07/92224535968.pdfIn PDF document text
    • https://kanijumedox.files.wordpress.com/2020/06/pudepibijidavesuteveneka.pdfIn PDF document text
    • https://busiputojug.files.wordpress.com/2020/06/1545267249.pdfIn PDF document text
    • https://ribowil807386363.files.wordpress.com/2020/07/2461171079.pdfIn PDF document text
    • https://zigonasoxovu.files.wordpress.com/2020/07/84121040700.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/59577082877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60233972239.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97072231683.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000075a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A9 5436 bytes
SHA-256: b0432351d30694624796f723ead7b1b280b4e7262fd4cf851e8100a77207679b
font_01_sfnt_off0000880e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880E 10188 bytes
SHA-256: 2c6520de7f0dabf8fb22074d1526a26fefd01d002bf99b7b72acd7a337045e6b

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