Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ed873c85217551…

MALICIOUS

PDF

47.1 KB Created: 2020-07-07 11:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 8f058ee8fc06274e82ac5fb7772375bd SHA-1: 45976800807576f16e8f180d2441ccf8854fe29e SHA-256: a9ed873c8521755112b556f8d18bb61156282e445c2494341507ad60819892dd
204 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links, including one to a known malicious redirector at `https://ttraff.com/wb?keyword=pdf%20viewer%20app%20android#pdf+viewer+app+android`. The document also impersonates a signing service, likely to trick the user into clicking the malicious link. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Document signing service impersonation lure medium SE_DOCUSIGN_LURE
    Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
  • 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=pdf%20viewer%20app%20android#pdf+viewer+app+android In PDF document text
    • http://files.imarsonline.com/uploads/1/3/1/3/131380413/6c76ebc2.pdfIn PDF document text
    • http://files.cateringandcreations.net/uploads/1/3/0/8/130814513/9295549.pdfIn PDF document text
    • http://files.reikifortheplanet.com/uploads/1/3/2/3/132302815/5645773.pdfIn PDF document text
    • http://files.cninc.org/uploads/1/3/2/7/132740479/5324237.pdfIn PDF document text
    • http://files.support.famhealth.com/uploads/1/3/1/4/131437740/3357936.pdfIn PDF document text
    • http://files.heatherseagraves.com/uploads/1/3/2/3/132302774/nufigidoruz-reverime-mojavo.pdfIn PDF document text
    • http://files.sproutsmyanmar.com/uploads/1/3/2/3/132302863/giburapudiga-dojowul.pdfIn PDF document text
    • http://files.explorestanton.com/uploads/1/3/1/4/131453216/6741733.pdfIn PDF document text
    • http://files.rabbitmountainlavender.com/uploads/1/3/0/7/130738625/futevukumuj_lulamatix_libujuferebetux.pdfIn PDF document text
    • http://files.christiestimber.com/uploads/1/3/2/3/132302815/a80bec9c772bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wigilisumi.files.wordpress.com/2020/06/fowefaxanab.pdfIn PDF document text
    • https://fanutuzak499104460.files.wordpress.com/2020/06/zowefudepedapik.pdfIn PDF document text
    • https://vuvogol.files.wordpress.com/2020/07/47928224801.pdfIn PDF document text
    • https://vosafeviba.files.wordpress.com/2020/06/fakavilufufepilarel.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C77 4688 bytes
SHA-256: 5a79effbab8381b255ab0c99bc6cd3db207a1aea23bdb881034911404a8fee32
font_01_sfnt_off00008c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C77 10328 bytes
SHA-256: 33ef2d01a7340ea6987e97e0a50f95c1679516cec2eb21b1e2318024fb497f1c

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