Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eff34a6e7b6f718…

MALICIOUS

PDF

114.2 KB Created: 2020-06-05 02:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e1a26907eb65405891dbe803f8dfa6ae SHA-1: ef26802017fc1c50c3a09b6c65c2801272b19624 SHA-256: 1eff34a6e7b6f718dc7885bdc4d3228f584a12da81dcb038a9a324a1186bf94a
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to domains associated with SEO link farms and redirectors. The ML classifier strongly indicated maliciousness, and the presence of links to known malicious redirectors confirms a high likelihood of user redirection to harmful sites. The document body text appears to be obfuscated or corrupted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/wp3?keyword=bioetica+y+medio+ambiente+pdf#bioetica+y+medio+ambiente+pdf In PDF document text
    • http://bonitanails.net/uploads/1/3/1/6/131606392/tevoxijagapuxuvupetu.pdfIn PDF document text
    • http://patientkindinc.com/uploads/1/3/0/6/130639476/gosamukudagis.pdfIn PDF document text
    • http://brettmgearing.com/uploads/1/3/0/5/130551154/acdfdead.pdfIn PDF document text
    • http://barrelagedcoffee.com/uploads/1/3/0/7/130776821/9699408.pdfIn PDF document text
    • http://straightshottransport.net/uploads/1/3/0/8/130813883/lowisil-zumuma-zufowora-jubusorewadisu.pdfIn PDF document text
    • http://filataiwan.com/uploads/1/3/1/4/131438667/b53e2c31652d401.pdfIn PDF document text
    • http://ga400portfoliofinancing.com/uploads/1/3/0/5/130539840/bed1fd5f76d1.pdfIn PDF document text
    • http://harmonyhistorical.org/uploads/1/3/1/4/131411245/toxuzifabajuxoxuma.pdfIn PDF document text
    • http://melissasuephoto.com/uploads/1/3/0/4/130488304/fuwudorifug-rijopopis-mosepifomorufes-kowek.pdfIn PDF document text
    • http://buildingalegacy313.org/uploads/1/3/1/1/131164311/safigatu.pdfIn PDF document text
    • http://sparta-ede.com/uploads/1/3/0/4/130483158/sevofevosirin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jiladige.files.wordpress.com/2020/06/mepapumure.pdfIn PDF document text
    • https://dakisil.files.wordpress.com/2020/06/48727618.pdfIn PDF document text
    • https://nitivemujite.files.wordpress.com/2020/06/sekixosikidasupolirij.pdfIn PDF document text
    • https://kuxogufebaji.files.wordpress.com/2020/06/49488360769.pdfIn PDF document text
    • https://wordpress.com/tos/In PDF document text
    • https://wordpress.com/dmca.htmlIn PDF document text
    • https://wordpress.com/policy.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000191d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191D9 12872 bytes
SHA-256: 31bcf717c8b5a3b6ea520b7621d7f2edf2de6c0b3011ec0156f7091c2515774b

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