Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11fd5009b2a7a80…

MALICIOUS

PDF

37.3 KB Created: 2020-11-01 20:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 940868c9eadf858bbc0529152155f934 SHA-1: adb6881ab43ff84d5f8fc266c6b57eed0cf98631 SHA-256: e11fd5009b2a7a805eccb304bc76d807885b948b717b6362804140cdca5abfff
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that redirect to other PDF files hosted on various disposable domains. The primary malicious URL identified is `https://ttraff.com/123?keyword=functional+resume+worksheet+word+document`, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the same lure and URLs, suggesting an attempt to drive traffic to malicious infrastructure.

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/123?keyword=functional+resume+worksheet+word+document In PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/944736.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/988fa418.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/sopobejojeva-sudorupivenigix-dikosiluf.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/vidabudivodeduwokobu.pdfIn PDF document text
    • https://dubamuxurel.weebly.com/uploads/1/3/4/4/134463085/18166.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/ea2cde568c9.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/piruxubowizogoxex.pdfIn PDF document text
    • https://gizumefelaz.weebly.com/uploads/1/3/4/3/134318195/zolaguzorovubeg.pdfIn PDF document text
    • https://lesajevix.weebly.com/uploads/1/3/4/3/134318042/8355457.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/461052d3-fcc9-4cc2-9403-fa10a4cab88a/38791448618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d78946-bd49-49d6-b028-8c0cf59e420a/32112161873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8acde2e-b1e0-45b9-b105-430fac94f6ff/xusilor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d32fc0-7921-43d5-aef1-156414caf441/navajo_loom_plans.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_off000055b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55B0 5292 bytes
SHA-256: efaf9db714737d159688b66d45c174f4defdb45c3d69e3568a422588bde91449
font_01_sfnt_off00006795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6795 9696 bytes
SHA-256: 7fc45e6510edbeb16702e924cae725f72cff20d97f64e8841044be6f7a810bc5

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