Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ff591e1f7e6a95…

MALICIOUS

PDF

41.1 KB Created: 2020-07-09 15:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 787da4f958a543b2632d3dd9be907b84 SHA-1: e9a64dbd7ec4312edf2ac2fb4015d60d002dd18d SHA-256: 28ff591e1f7e6a953f7d1e051c62221f8bbdb8ef11e9ba2c10e207d5e1d6374c
184 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One critical heuristic indicates a malicious redirector link to 'ttraff.com'. The document body contains garbled text but includes the same redirector URL. The primary attack pattern appears to be the distribution of numerous links, likely to manipulate search engine results or to host malicious content, rather than a direct user-facing lure.

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=grid%20paper%20pdf%20a4 In PDF document text
    • http://files.bambooartscenter.com/uploads/1/3/1/8/131857071/pujeriwetid-napofemerumaw.pdfIn PDF document text
    • http://files.key2evolve.com/uploads/1/3/0/8/130874318/zasabuxemer_xawapikiguromik_balasoge.pdfIn PDF document text
    • http://files.rhythmresearchresources.net/uploads/1/3/1/6/131606127/gelizoxi-mevep-xuzumifam.pdfIn PDF document text
    • http://files.trebor-ts.com/uploads/1/3/1/8/131871690/4fa93.pdfIn PDF document text
    • http://files.michelletjohnson.com/uploads/1/3/1/4/131407424/6387409.pdfIn PDF document text
    • http://files.coronaumc.com/uploads/1/3/1/4/131454436/nutotu.pdfIn PDF document text
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://riduvetixaxu.files.wordpress.com/2020/06/67439980271.pdfIn PDF document text
    • https://sefofulevap.files.wordpress.com/2020/06/malinosolilex.pdfIn PDF document text
    • https://komamik.files.wordpress.com/2020/06/83513340407.pdfIn PDF document text
    • https://jununal.files.wordpress.com/2020/07/94347357025.pdfIn PDF document text
    • https://porawinag.files.wordpress.com/2020/07/wafimagidafanisi.pdfIn PDF document text
    • https://baxejubox.files.wordpress.com/2020/07/79405990499.pdfIn PDF document text
    • https://somotug.files.wordpress.com/2020/06/44609119071.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46605756913.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92283418618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pexigubozorabavajodumixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bujebunefevefosilipepeju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50878135704.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_off0000661f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x661F 4436 bytes
SHA-256: 3826b16a71e7386944af3f822c7f480bdb2912bdeb61206c0d9a9c50459ba688
font_01_sfnt_off00007548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7548 10084 bytes
SHA-256: 861044fe31f1684fbd783c30aeaf1d0c82c09cc07081e6c200f7be34044410c2