Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc18636e6f80e1ff…

MALICIOUS

PDF

52.5 KB Created: 2020-07-08 18:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: d9558ddf8388e80ad50fa830d276ec37 SHA-1: 125a6708277b44eed64e175bc10a11d7db2dd66e SHA-256: cc18636e6f80e1ffe6a3af018381d1e42ea59d80ef41cdc472f3033a7290107f
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with the primary link directing to a known malicious redirector. The document body, though obfuscated, suggests an attempt to disguise malicious links as an educational worksheet. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent for traffic redirection 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.com/wb?keyword=simultaneous%20equation%20elimination%20worksheet In PDF document text
    • http://files.fenianfear.com/uploads/1/3/0/7/130739069/2003883.pdfIn PDF document text
    • http://files.thefashionanalyst.com/uploads/1/3/1/3/131383624/wezunawe.pdfIn PDF document text
    • http://files.milegion-legacyrun.org/uploads/1/3/1/4/131409385/347348cfe8.pdfIn PDF document text
    • http://files.hound47.com/uploads/1/3/1/3/131398367/mimikosekud-logekefa-zosem.pdfIn PDF document text
    • http://files.pmawm.com/uploads/1/3/0/7/130738933/lesutubivutuwi_tekivegirole_gagujapodunen.pdfIn PDF document text
    • http://files.vthcv.org/uploads/1/3/1/4/131406606/1110088.pdfIn PDF document text
    • http://files.sharidellapenna.com/uploads/1/3/0/7/130776567/xaroradiki_radebodujaze_gozome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jodopeku.files.wordpress.com/2020/07/48562935946.pdfIn PDF document text
    • https://gunamitiluj.files.wordpress.com/2020/06/96894283967.pdfIn PDF document text
    • https://fiwasaserop.files.wordpress.com/2020/06/64235287242.pdfIn PDF document text
    • https://nafufaborur.files.wordpress.com/2020/07/98639542262.pdfIn PDF document text
    • https://rifilaru.files.wordpress.com/2020/06/zelolawadabawokope.pdfIn PDF document text
    • https://fusikazisome.files.wordpress.com/2020/06/wenubiwipesiwumilifobopap.pdfIn PDF document text
    • https://navofifur.files.wordpress.com/2020/06/kajojawugilokonuga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voriwatovetizejewadodo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27482348981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.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_off000089dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DC 5192 bytes
SHA-256: 334445f299ef399e801bd11c8c66b69401ece62391be8eca0df56a8fb98c78c2
font_01_sfnt_off00009b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5A 13260 bytes
SHA-256: 367e8b1027ebff24090e39049f3cca6797f89bba194e33e4f2afb6faddbd8334

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