Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d7bf5aaaabc74f…

MALICIOUS

PDF

36.6 KB Created: 2020-10-26 05:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 48bd39e024f5433480ea0a1e4c843710 SHA-1: 12ffcd0eb1ea7d8093a9723117ec086c675908ce SHA-256: 11d7bf5aaaabc74f777ab0c215ab79fe48391ba19eb086280fac8c334e5890d2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, containing numerous embedded URLs that point to other PDFs hosted on disposable domains. The ultimate destination for many of these links is a malicious redirector at 'ttraff.cc', indicating a likely phishing or malware distribution scheme. The ML classifier strongly supports the malicious nature of this file.

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/123?keyword=playzone+fit+balance+blox+instructions In PDF document text
    • https://vasedowazapen.weebly.com/uploads/1/3/4/3/134320052/fotebakezedokogekog.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/zerugijo_kebejanukuxu_gonejad.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/bfcfaa.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/rovusuwu_bimuwuxilewivug_sekadelulakara_dafezurajejijat.pdfIn PDF document text
    • https://kajukuka.weebly.com/uploads/1/3/4/3/134307777/rodegonor-lepasum-losutozi.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/xirenesedato.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/zavegikopereki_buwotu.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/4024414.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/kuziwotozumuge.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/8577010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5f9370f402dcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f907627260d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4763/6122/files/54496728488.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/2800/9119/files/tesla_inventor_of_the_electrical_age_download.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/first_day_of_school_icebreakers.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/analise_de_risco_de_credito.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_off00004eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EED 5236 bytes
SHA-256: 4dc4a1678236ffbe8e11827f87a7f9224624dd2199973f9ab6e2337037b69f96
font_01_sfnt_off000060de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DE 10704 bytes
SHA-256: 4e4f2e9c60f26d1fcf8eee8d5c57e52a0ff1ca3706d142ef601cada1bf0954e4

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