Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecff7e96e208ce1…

MALICIOUS

PDF

44.7 KB Created: 2020-10-14 21:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6b0af2e6f6a452539cb636a76e184c99 SHA-1: c88c2068ca4f6f2ef805e567a6142b31b95137ba SHA-256: 3ecff7e96e208ce1cc70616c4a4e285544abd5815f8d785bff7fac5cb0b8b0e6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'flash drive not detected on android', suggesting a lure to trick users into clicking the malicious links. The presence of a link farm on disposable hosting further indicates malicious intent.

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://cctraff.ru/pify?keyword=flash+drive+not+detected+on+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f86fe9e0e6ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f87007b1f1d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f870c87ed4fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_5f871f701cf10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f870bd085db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f873eb8ecf0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f8742877caf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f873f0570e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f8731179640b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f870511e2d0f.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/kedoxezezaj-temolej-zunemalavorun-mutelokowomimi.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/dofelamidagalofux.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/jatelu-zukolugaw.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/a63fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f8726cb2bf58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f87406050ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f870df392a87.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/rufub.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00006ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFA 5044 bytes
SHA-256: 511ebfeaaaa23f3aecd7fc3829213206c291853a1b56d4cdaf0e24bf788da007
font_01_sfnt_off0000811b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x811B 10716 bytes
SHA-256: 5bc73fccd049649a55b95bdef9958c61b779dd4e9e3f7e50f0382cd32af1fc86