Malicious PDF — malware analysis report

Static analysis result for SHA-256 a809036a1cd0b5fc…

MALICIOUS

PDF

45.5 KB Created: 2020-07-10 13:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 5ea8db3dcf969f02a7cf255390d6c2b9 SHA-1: 891fa1939a5916b9f78ac42f715a5d2fc5c77d9e SHA-256: a809036a1cd0b5fc4143185d47ef03054325fa829a551ba4b538db02eaf8c641
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. One critical heuristic identified a malicious redirector link to 'ttraff.com', suggesting a phishing or malware distribution attempt. The document body, while containing garbled text, also includes the same URLs, reinforcing the attack pattern. No scripts were extracted from this sample.

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=programma%20elettorale%20fratelli%20d In PDF document text
    • http://files.onceuponarockvermont.com/uploads/1/3/0/8/130874295/2411951.pdfIn PDF document text
    • http://files.gbsupplyco.com/uploads/1/3/0/7/130739318/dinuzumapa_sixunufosaj_jizipujib.pdfIn PDF document text
    • http://files.davidwagnermedia.com/uploads/1/3/0/8/130815124/2062cae536.pdfIn PDF document text
    • http://files.therealitynews254.com/uploads/1/3/1/3/131398264/9109834.pdfIn PDF document text
    • http://files.maidtoshineservices.net/uploads/1/3/1/4/131437268/29f33e.pdfIn PDF document text
    • http://files.chicoanimalshelter.org/uploads/1/3/2/3/132303312/tuzobun.pdfIn PDF document text
    • http://files.danielaneri.eu/uploads/1/3/1/4/131454770/6c59d.pdfIn PDF document text
    • http://files.srtarchitect.com/uploads/1/3/2/6/132681296/7220946.pdfIn PDF document text
    • http://files.myncpl.com/uploads/1/3/0/7/130739183/702181.pdfIn PDF document text
    • http://files.principledrywall.com/uploads/1/3/2/7/132741194/lidozisizet_moseb_jabaxo_rewugufixaguraw.pdfIn PDF document text
    • http://files.auntluluskitchen.com/uploads/1/3/1/3/131379951/7815297.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zoruwebi.files.wordpress.com/2020/06/4161004945.pdfIn PDF document text
    • https://juwurel.files.wordpress.com/2020/06/21196135369.pdfIn PDF document text
    • https://vokalavejof.files.wordpress.com/2020/06/20170705285.pdfIn PDF document text
    • https://vuketuwowi.files.wordpress.com/2020/07/19803966769.pdfIn PDF document text
    • https://zexekiko.files.wordpress.com/2020/06/walaziserip.pdfIn PDF document text
    • https://xosuvenivon.files.wordpress.com/2020/07/lipubumebepetotef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xidegafizupewutuzu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nidosavexurirevinuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kikurum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xedatojif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/14192803693.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72B5 4900 bytes
SHA-256: fcb82aad045e41539b5287a7399a146b82f7a96430de3d7aae00faa7126148fa
font_01_sfnt_off0000836a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836A 10988 bytes
SHA-256: 5ab8e330ab7f5e3e2391f5a89628ac8d83adb8375aade10d85b83414adaebc88