Malicious PDF — malware analysis report

Static analysis result for SHA-256 3145cacfa6875e57…

MALICIOUS

PDF

42.3 KB Created: 2020-07-10 08:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7d8b544d03e4bc90f96c2194b1d940e5 SHA-1: 2ae8e8d1aea98d65cc5c4ab255ea546c75f1a97e SHA-256: 3145cacfa6875e57271641d31631630ce858c89103025fe8264ec047a7f36120
184 Risk Score

Malware Insights

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

The PDF document is identified as malicious due to its inclusion of numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. One critical heuristic firing indicates a direct link to a known malicious redirector infrastructure. The document body, while appearing to be an exam sample, contains these embedded links, suggesting a deceptive lure.

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=cambridge%20b2%20exam%20sample%20pdf In PDF document text
    • http://files.thetrendylegacy.com/uploads/1/3/0/9/130969300/13d1f94d.pdfIn PDF document text
    • http://files.middleclassempowermentzone.org/uploads/1/3/1/3/131383018/felixogotolako-xawavorukate-wizijoboro.pdfIn PDF document text
    • http://files.krabidream.com/uploads/1/3/2/6/132681566/3285554.pdfIn PDF document text
    • http://files.mrburkholder.com/uploads/1/3/0/7/130775368/gubol_dozilijuw_zedorabonu.pdfIn PDF document text
    • http://files.anxiouslittlepishy.com/uploads/1/3/0/7/130776603/3359709.pdfIn PDF document text
    • http://files.jeffcofiretraining.org/uploads/1/3/2/6/132681409/4110604.pdfIn PDF document text
    • http://files.nicholsbaptistchurch.com/uploads/1/3/1/1/131164419/8acf28.pdfIn PDF document text
    • http://files.foodloopcompost.com/uploads/1/3/1/0/131070918/vazizokixur-zixonomije-jufawepurani-kawoxu.pdfIn PDF document text
    • http://files.meridianbodycare.com/uploads/1/3/1/8/131857193/6976761.pdfIn PDF document text
    • http://files.southcoastwarriors.com/uploads/1/3/1/3/131398093/zuzuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sinegimagex.files.wordpress.com/2020/06/dirodiseserililifutuloku.pdfIn PDF document text
    • https://zoragevis.files.wordpress.com/2020/07/joliredanuwipuwigup.pdfIn PDF document text
    • https://seteletunifa.files.wordpress.com/2020/06/gotizapuvarigeradab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3359516262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50036278562.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/42262915950.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_off000067ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AE 5216 bytes
SHA-256: 0c5bf148b463082b01c64fff4d2c297637d16552f1bca8dbca60e462df07faa0
font_01_sfnt_off0000796e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x796E 10316 bytes
SHA-256: 6863a3afd607b479f8a91114c8b5ae5140b8e5223b42c74442fab7d91005c241

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